Add issue templates

Signed-off-by: Julius Härtl <jus@bitgrid.net>

.github/ISSUE_TEMPLATE/Bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+labels: bug
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**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.
+
+**Client details:**
+ - OS: [e.g. iOS]
+ - Browser [e.g. chrome, safari]
+ - Version [e.g. 22]
+ - Device: [e.g. iPhone6, desktop]
+
+<details>
+<summary>Server details</summary>
+<!--
+You can use the Issue Template application to prefill most of the required information: https://apps.nextcloud.com/apps/issuetemplate
+-->
+**Social app version:**
+
+**Operating system**:
+
+**Web server:**
+
+**Database:**
+
+**PHP version:**
+
+**Nextcloud version:** (see Nextcloud admin page)
+
+</details>
+
+<details>
+<summary>Logs</summary>
+
+#### Nextcloud log (data/nextcloud.log)
+```
+Insert your Nextcloud log here
+```
+
+#### Browser log
+```
+Insert your browser log here, this could for example include:
+
+a) The javascript console log
+b) The network log
+c) ...
+```
+
+</details>

.github/ISSUE_TEMPLATE/Feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+labels: enhancement
+---
+
+**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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+
+* Resolves: # <!-- related github issue -->
+* Target version: master 
+
+### Summary
+
+