📝 Add GitHub templates for issues and PR

Signed-off-by: mathieu.brunot <mathieu.brunot@monogramm.io>

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+
+name: Bug report
+about: Create a report to help us improve
+labels: bug
+
+---
+
+<!--- Please keep this note for other contributors -->
+
+### How to use GitHub
+
+* Please use the 👍 [reaction](https://blog.github.com/2016-03-10-add-reactions-to-pull-requests-issues-and-comments/) to show that you are interested into the same feature.
+* Please don't comment if you have no relevant information to add. It's just extra noise for everyone subscribed to this issue.
+* Subscribe to receive notifications on status change and new comments.
+
+### Describe the bug
+A clear and concise description of what the bug is.
+
+#### Screenshots
+If applicable, add screenshots to help explain your problem.
+
+### Steps to reproduce
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+### Expected behaviour
+A clear and concise description of what you expected to happen.
+
+### Server configuration
+
+**Operating system:**
+
+**Web server:**
+
+**Database:**
+
+**PHP version:**
+
+**Nextcloud version:** (see Nextcloud admin page)
+
+**Updated from an older Nextcloud/ownCloud or fresh install:**
+
+**Where did you install Nextcloud from:**
+
+**Signing status:**
+<details>
+<summary>Signing status</summary>
+
+```
+Login as admin user into your Nextcloud and access 
+http://example.com/index.php/settings/integrity/failed 
+paste the results here.
+```
+</details>
+
+**List of activated apps:**
+<details>
+<summary>App list</summary>
+
+```
+If you have access to your command line run e.g.:
+sudo -u www-data php occ app:list
+from within your Nextcloud installation folder
+```
+</details>
+
+**Nextcloud configuration:**
+<details>
+<summary>Config report</summary>
+
+```
+If you have access to your command line run e.g.:
+sudo -u www-data php occ config:list system
+from within your Nextcloud installation folder
+
+or 
+
+Insert your config.php content here. 
+Make sure to remove all sensitive content such as passwords. (e.g. database password, passwordsalt, secret, smtp password, …)
+```
+</details>
+
+**Are you using external storage, if yes which one:** local/smb/sftp/...
+
+**Are you using encryption:** yes/no
+
+**Are you using an external user-backend, if yes which one:** LDAP/ActiveDirectory/Webdav/...
+
+#### LDAP configuration (delete this part if not used)
+<details>
+<summary>LDAP config</summary>
+
+```
+With access to your command line run e.g.:
+sudo -u www-data php occ ldap:show-config
+from within your Nextcloud installation folder
+
+Without access to your command line download the data/owncloud.db to your local
+computer or access your SQL server remotely and run the select query:
+SELECT * FROM `oc_appconfig` WHERE `appid` = 'user_ldap';
+
+
+Eventually replace sensitive data as the name/IP-address of your LDAP server or groups.
+```
+</details>
+
+### Client configuration
+**Browser:**
+-   Browser (e.g. chrome, safari)
+-   Version (e.g. 22)
+
+**Operating system:**
+-   Device: (e.g. iPhone6)
+-   OS: (e.g. iOS)
+
+### Logs
+
+<!--- Reports without logs might be closed as unqualified reports! -->
+
+#### Web server error log
+<details>
+<summary>Web server error log</summary>
+
+```
+Insert your webserver log here
+```
+</details>
+
+#### Nextcloud log (data/nextcloud.log)
+<details>
+<summary>Nextcloud log</summary>
+
+```
+Insert your log here
+```
+</details>
+
+#### Browser log
+<details>
+<summary>Browser log</summary>
+
+```
+Insert your browser log here, this could for example include:
+
+a) The javascript console log
+b) The network log
+c) ...
+```
+</details>
+
+### Additional context
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+
+name: Feature request
+about: Suggest an idea for this project
+labels: enhancement
+
+---
+
+<!--- Please keep this note for other contributors -->
+
+### How to use GitHub
+
+* Please use the 👍 [reaction](https://blog.github.com/2016-03-10-add-reactions-to-pull-requests-issues-and-comments/) to show that you are interested into the same feature.
+* Please don't comment if you have no relevant information to add. It's just extra noise for everyone subscribed to this issue.
+* Subscribe to receive notifications on status change and new comments.
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. 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.

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+
+Some key notes before you open a PR:
+
+ 1. Select which branch should this PR be merged in? By default, you should always merge to the develop branch.
+ 2. PR name follows [convention](http://karma-runner.github.io/4.0/dev/git-commit-msg.html)
+ 3. All tests pass locally, UI and Unit tests
+ 4. All business logic and validations must be on the server-side
+ 5. Update necessary Documentation
+ 6. Put `closes #XXXX` in your comment to auto-close the issue that your PR fixes
+
+
+Also, if you're new here
+
+- Contribution Guide => https://github.com/strukturag/nextcloud-spreed-signaling/blob/master/CONTRIBUTING.md
+
+-->
+
+> Please provide enough information so that others can review your pull request:
+
+<!-- You can skip this if you're fixing a typo or updating existing documentation -->
+
+> Explain the **details** for making this change. What existing problem does the pull request solve?
+
+<!-- Example: When "Adding a function to do X", explain why it is necessary to have a way to do X. -->
+
+> Screenshots/GIFs
+
+<!-- Add images/recordings to better visualize the change: expected/current behviour -->