chore: set up issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a bug report to help us improve RDMO
+labels: 'type: bug'
+
+---
+
+### Description / Beschreibung
+
+A clear and concise description of what the bug is.
+
+### Expected behaviour / Erwartetes Verhalten
+
+A clear and concise description of what you expected to happen.
+
+### Steps to reproduce / Schritte zum Reproduzieren
+
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+### Context / Kontext
+
+Please state your operating system, the RDMO version, and (if applicable) the browser the error occurred in.
+
+### References / Verweise
+
+*

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for a new or extended feature in RDMO
+labels: 'type:feature-request'
+
+---
+
+### Rationale / Begründung
+
+A clear and concise description of what the problem is, followed by the solution you'd like.
+
+### Affected
+
+Who is affected by the change (Users, Managers, Admins)?
+
+### Minimal functionality
+
+What functionality would you like to have?
+
+### Nice-to-have functionality
+
+What sort of related functionality would you like to see in addition?
+
+### References / Verweise
+
+*