No issue: Added issue templates

.github/ISSUE_TEMPLATE/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. ...
+2. ...
+
+If possible, attach a minimal file that triggers the error. 
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Error message**
+If applicable, add the error message to help explain your problem.
+
+**Please complete the following information:**
+ - Version: [Please fill in the version number]
+ - OS: [e.g. Windows, Linux, OS X]
+
+**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.

.github/ISSUE_TEMPLATE/refactoring.md

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+---
+name: Refactoring (for developers)
+about: Refactor the application
+
+---
+
+**Describe the refactoring action**
+A clear and concise description of what the action is.
+
+**Expected benefit**
+A clear and concise description of what you expect to improve by the refactoring.

.github/ISSUE_TEMPLATE/release.md

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+---
+name: Release
+about: Create a new release of cassis
+
+---
+
+**Checklist**
+
+- [ ] Make sure all issues for the milestone are completed, otherwise move them
+- [ ] Checkout the `main` branch
+- [ ] Bump the version in `cassis/__version__.py` to a stable one, e.g. `__version__ = "0.6.0"`, commit and push
+- [ ] Check and wait that the build completed. 
+- [ ] Create a tag for that version and push it
+- [ ] Wait for the build and Pypi to show the new version
+- [ ] Bump the version to the next development version, commit and push that.
+- [ ] Convert the tag to a release on Github, write release note based on issues in the respective milestone
+- [ ] Create a new milestone