create issue templates (#3952)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a bug report to help us improve
+title: ''
+labels: 'bug - unconfirmed'
+assignees: ''
+---
+
+**Describe the bug**
+A clear and concise description about the issue you encounter.
+
+**To Reproduce**
+Steps to reproduce the behavior.
+
+**Debug file**
+
+If possible, please add a debug report. To do that, drag a text file with the debug report in here.

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+  - name: Need help? Ask a question in the Q&A section
+    url: https://github.com/raspiblitz/raspiblitz/discussions/categories/q-a
+    about: Community support for questions
+  - name: Have an idea for a new app in the RaspiBlitz? Make a suggestion in the app ideas section
+    url: https://github.com/raspiblitz/raspiblitz/discussions/categories/feature-app-ideas
+    about: Feature and app ideas

.github/ISSUE_TEMPLATE/documentation_improvement.md

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+---
+name: Documentation Improvement
+about: Improvement suggestions for the documentation
+title: ''
+labels: 'documentation'
+assignees: ''
+---

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Enhancement suggestions for the RaspiBlitz
+title: ''
+labels: 'enhancement'
+assignees: ''
+---