Update issue templates (#4839)

* Update issue templates
* Contrib file example
* Add support file
* Make 'important' docs more accessible
* Link to contributing, add header on PR template

.github/ISSUE_TEMPLATE/bug_report.md

+---
+name: Bug report
+about: Create a report to help us improve GLPI (plugins issues are not handled here).
+
+---
+
+<!--
+
+Dear GLPI user.
+
+BEFORE SUBMITTING YOUR ISSUE, please make sure to read and follow these steps:
+
+* We don't support community plugins. Contact directly their authors, or use the community forum : https://forum.glpi-project.org.
+* For feature requests or enhancements, use the suggest dedicated site (https://suggest.glpi-project.org). We check it very often.
+* We prefer to keep this tracker in ENGLISH. If you want support in your language, the community forum (https://forum.glpi-project.org) is the best place.
+* Please use the below template.
+
+For more informations, please check contributing guide:
+https://github.com/glpi-project/glpi/blob/master/CONTRIBUTING.md
+
+The GLPI team.
+-->
+
+**Describe the bug**
+
+A clear and concise description of what the bug is.
+
+**Page(s) URL**
+
+If applicable, page(s) URL where the bug happens.
+
+**To reproduce**
+
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+
+If applicable, add screenshots to help explain your problem.
+
+
+**Your GLPI setup (you can find it in Setup > General menu, System tab)**
+
+```
+paste here
+```
+
+**Additional context**
+
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

+---
+name: Feature request
+about: Ideas to be implemented, must be discussed first on suggestion website (https://suggest.glpi-project.org)
+
+---
+
+<!--
+
+Dear GLPI user.
+
+BEFORE SUBMITTING YOUR FEATURE REQUEST, please make sure to read and follow these steps :
+
+* We don't support community plugins. Contact directly their authors, or use the community forum : https://forum.glpi-project.org.
+* Use the suggest dedicated site (https://suggest.glpi-project.org ) unless you are going to work on it yourself. We check it very often.
+* We prefer to keep this tracker in ENGLISH. If you want support in your language, the community forum (https://forum.glpi-project.org) is the best place.
+* Please use the below template.
+
+For more informations, please check contributing guide:
+https://github.com/glpi-project/glpi/blob/master/CONTRIBUTING.md
+
+The GLPI team.
+-->
+
+**Is your feature request related to a problem? Please describe.**
+
+A clear and concise description of what the problem is. E.g. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+
+Add any other context or screenshots about the feature request here.

CONTRIBUTING.md

+# Contributing to GLPI
+
+:+1::tada: First off, thanks for taking the time to contribute! :tada::+1:
+
+Please note that current repository is about GLPI core only. All related plugins are the responsibility of their respective owners and all requests must be done on their own systems.
+
+**Please write only in english!**
+
+## Bugs
+
+Note that issues are handled on a best-effort basis. If you need a quick fix or any guarantee, take a look at **[profesionnal services](http://services.glpi-network.com/)** or [partners](https://glpi-project.org/partners/).
+
+If you found a bug, the first steps to do are:
+- check if you're using the latest version, and if not, upgrade to see if problem is not yet solved,
+- search in already existing tickets to see if someone else already report the issue.
+
+If the last release does not solve the issue and there is no existing ticket, create one using the bug report template. Be sure you provide all requested details, log entries, and whatever may be usefull to understand and reproduce the issue.
+
+If developpers are not able to reproduce the issue, it may not be fixed.
+
+## Features
+
+If you want to work on a new feature, open a ticket using the feature template, so we can discuss on it.
+
+If you're just asking for something to be added without doing it yourself, please consider adding (or upvoting) an enhancement on the [suggestion website](https//suggest.glpi-project.org).
+
+## Support request
+
+You have a question on GLPI usage, or want to know what are the capabilities.
+
+Current repository is not the right place for that. You may try to aks your question on [the forums](https://forum.glpi-project.org), on the mailing lists, on telegram channels, ...

ISSUE_TEMPLATE.md

+<!--
+
 Dear GLPI user.
 
-BEFORE SUBMITTING YOUR ISSUE, please make sure to read and follow these steps :
+BEFORE SUBMITTING YOUR ISSUE, please make sure to read and follow these steps:
 
-* We don't support community plugins. Contact directly their authors, or use the community forum : http://forum.glpi-project.org.
-* For feature requests or enhancements, use the suggest dedicated site (http://suggest.glpi-project.org ). We check it very often.
-* We prefer to keep this tracker in ENGLISH. If you want support in your language, the community forum (http://forum.glpi-project.org) is the best place.
+* We don't support community plugins. Contact directly their authors, or use the community forum : https://forum.glpi-project.org.
+* For feature requests or enhancements, use the suggest dedicated site (https://suggest.glpi-project.org). We check it very often.
+* We prefer to keep this tracker in ENGLISH. If you want support in your language, the community forum (https://forum.glpi-project.org) is the best place.
 * Please use the below template.
-* Delete this text before submiting your issue.
+
+For more informations, please check contributing guide:
+https://github.com/glpi-project/glpi/blob/master/CONTRIBUTING.md
 
 The GLPI team.
+-->
+
+**Describe the bug**
 
-------------
-* Steps to reproduce (which actions have you made) :
+A clear and concise description of what the bug is.
 
+**Page(s) URL**
 
-* Expected result :
+If applicable, page(s) URL where the bug happens.
 
+**To reproduce**
 
-* Actual result :
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
 
+**Expected behavior**
 
-* URL of the page :
+A clear and concise description of what you expected to happen.
 
+**Screenshots**
 
-* Screenshot of the problem (if pertinent) :
+If applicable, add screenshots to help explain your problem.
 
 
-* Your GLPI setup (you can find it in Setup > General menu, System tab) :
+**Your GLPI setup (you can find it in Setup > General menu, System tab)**
+
 ```
 paste here
 ```
 
+**Additional context**
+
+Add any other context about the problem here.

PULL_REQUEST_TEMPLATE.md

+<!--
+
+Dear GLPI user.
+
+BEFORE SUBMITTING YOUR ISSUE, please make sure to read and follow these steps:
+
+* We don't support community plugins. Contact directly their authors, or use the community forum : http://forum.glpi-project.org.
+* For feature requests or enhancements, use the suggest dedicated site (http://suggest.glpi-project.org). We check it very often.
+* We prefer to keep this tracker in ENGLISH. If you want support in your language, the community forum (http://forum.glpi-project.org) is the best place.
+* Please use the below template.
+
+For more informations, please check contributing guide:
+https://github.com/glpi-project/glpi/blob/master/CONTRIBUTING.md
+
+The GLPI team.
+-->
+
+
 | Q             | A
 | ------------- | ---
 | Bug fix?      | yes/no
@@ -6,5 +24,3 @@
 | Deprecations? | no
 | Tests pass?   | yes
 | Fixed tickets | #number
-
-*Please update this template with something that matches your PR*
\ No newline at end of file

SUPPORT.md

+# GLPI support
+
+Looking for help on usage, capabilities or even configuration of your GLPI instance?
+
+You can ask on:
+- [GLPI forums](https://forum.glpi-project.org),
+- [GLPI Telegram channel](https://t.me/glpien),
+- [GLPI IRC channel](http://webchat.freenode.net/?channels=glpi) #glpi on Freenode,
+- Subscribe to one of [GLPI mailing lists](https://glpi-project.org/community).
+
+You may also be looking for [GLPI documentation](https://glpi-project.org/resources/#documentation).