Add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug to help fixing it
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+If known, steps to reproduce the behavior:
+1. Use '...'
+2. Click on '....'
+3. Input '....'
+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.
+
+**Log**
+Add the contents of debug.txt if possible under the last separator before the bug appeared.
+
+**Desktop (please complete the following information):**
+ - Minetest version: [If you are on a devel version, please add git commit hash
+You can use `minetest --version` to find it.]
+ - Other mods activated: [mods activated in the world where the bug appeared this mod depends on or that depend on this mod]
+
+**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
+
+---
+
+**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.