new: [gh] some bug report templates

.github/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+**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 & Logs**
+If applicable, please add screenshots and/or logs to help explain your problem.
+
+**Desktop (please complete the following information):**
+ - OS+Distribution Version: [e.g. Ubuntu 16.04, FreeBSD 10]
+ - Browser (if relevant) [e.g. chrome, safari]
+ - Munin Version [e.g. 2.0.35]
+
+**Additional context**
+Add any other context about the problem here.

.github/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.