Update issue templates

New templates for issues

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve OpenSlides
+title: ""
+labels: bug
+assignees: ""
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**How to Reproduce**
+Steps to reproduce the behavior: preferably on [nighty](https://nightly.demo.openslides.org)
+
+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.
+
+**System information**
+
+- OpenSlides-Version: [e.g. 2.1, 2.2, 2.3, 3,0]
+- Additional version information (if any): [e.g. commit hash or installation-month]
+- Python Version: [e.g. 3,5, 3.6, 3.7]
+- Device: [e.g. iPhone6, Notebook]
+- OS: [e.g. Andoird 7, iOS8.1, Windows 10]
+- Browser: [e.g. chrome, firefox, opera, edge, safari]
+- Browser-Version: [e.g. 22]
+
+**Additional context**
+Add any other information to comprehend your problem
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for OpenSlides
+title: ""
+labels: feature
+assignees: ""
+---
+
+**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.