Update issue templates: choose between bug and feature request

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+### Actual behaviour
+- Tell us what happens
+
+### Expected behaviour
+- Tell us what should happen
+ 
+### Steps to reproduce
+1. 
+2. 
+3. 
+
+
+### Environment data
+Android version:
+
+Device model: 
+
+Stock or customized system:
+
+Nextcloud app version:
+
+Nextcloud server version:
+
+### Logs
+#### Web server error log
+```
+Insert your webserver log here
+```
+
+#### Nextcloud log (data/nextcloud.log)
+```
+Insert your Nextcloud log here
+```
+**NOTE:** Be super sure to remove sensitive data like passwords, note that everybody can look here! You can use the Issue Template application to prefill some of the required information: https://apps.nextcloud.com/apps/issuetemplate

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+**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.