tools: add GitHub templates for bug reporting / features / pull reque…

…sts (#13)

#13

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Errors you encountered
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Error message**
+Error that was thrown (if available)
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Additional context**
+Add any other context about the problem here, like configuration you have in place, network connection, etc.
+
+**To Reproduce**
+Steps to reproduce the behavior
+
+**Environment**
+ - Operating System (OS):
+ - Library version (commit or version number):
+ - Home Assistant version:
+ - Last working Home Assistant release (if known):

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Something unclear? Just ask to our community!
+    url: https://discord.gg/NSmAPWw8tE
+    about: Join our Discord channel!

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+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.

.github/pull_request_template.md

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+### Related Issues
+
+- #issue-number
+
+### Proposed Changes:
+ <!--- In case of a bug: Describe what caused the issue and how you solved it -->
+ <!--- In case of a feature: Describe what did you add and how it works -->
+
+### Testing:
+<!-- unit tests, integration tests, manual verification, instructions for manual tests -->
+
+### Extra Notes (optional):
+<!-- E.g. point out sections where the reviewer should validate your reasoning -->
+<!-- E.g. point out questions that are still opened -->
+
+### Checklist
+
+- [ ] Related issues and proposed changes are filled
+- [ ] Tests are defining the correct and expected behavior
+- [ ] Code is well-documented via docstrings