chore(github): add issue templates

relates to STACKITTPR-138

Author: rubenhoenle

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,48 @@
+---
+name: Bug report
+about: Report a bug in the STACKIT Python SDK
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+## Description
+
+*Please add a clear and concise description of what the bug is.*
+
+## Steps to reproduce
+<!-- Please add a small python example below which helps us reproduce the behavior. -->
+
+```python
+# put your python example here
+# ...
+```
+
+<!-- Please provide us with the steps to reproduce the behavior. -->
+
+1. Run ...
+2. ...
+
+## Actual behavior
+
+*Please describe the current behavior of the STACKIT Python SDK. Don't forget to add detailed information like error messages.*
+
+## Expected behavior
+
+*Please describe the behavior which you would expect from the STACKIT Python SDK in that case.*
+
+## Environment
+ - OS: 
+ - Python version (see `python --version`): `3.X.X`
+ - Version of the Python STACKIT SDK: 
+
+```
+# please run the following command to get the versions of the STACKIT Python SDK versions and add the output here in this code block
+
+$ pip list | grep "stackit"
+```
+
+**Additional information**
+
+*Feel free to add any additional information here.*

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,33 @@
+---
+name: Feature request
+about: Suggest an idea for the STACKIT Python SDK
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+## Problem description
+
+*Is your feature request related to a problem? If so, please give us a clear and concise description of what the problem is. 
+Example: I want to use the STACKIT Python SDK to implement [...] but I couldn't find a way to [...]*
+
+## Proposed solution
+
+*A clear and concise description of what you want to happen.*
+
+<!-- Please add a Python example below which helps us understand your proposed solution. -->
+
+```python
+# put your Python example here
+# ...
+```
+
+## Alternative solutions (optional)
+
+*A clear and concise description of any alternative solutions or features you've considered. (optional)*
+
+## Additional information
+
+*Feel free to add any additional information here.*
+

.github/pull_request_template.md

@@ -11,6 +11,10 @@ relates to #1234
 
 - [ ] Issue was linked above
 - [ ] **No generated code was adjusted manually** (check [comments in file header](https://github.com/stackitcloud/stackit-sdk-python/blob/main/services/dns/src/stackit/dns/api_client.py#L10-L12))
+- [ ] Changelogs and versioning
+    - [ ] Changelog in root directory was adjusted (see [here](https://github.com/stackitcloud/stackit-sdk-python/blob/608176ab8cdfa60a3cfb09da49de0b1aba5fea84/CHANGELOG.md))
+    - [ ] Changelog of the service(s) was adjusted (see e.g. [here](https://github.com/stackitcloud/stackit-sdk-python/blob/608176ab8cdfa60a3cfb09da49de0b1aba5fea84/services/dns/CHANGELOG.md))
+    - [ ] `pyproject.toml` of the service(s) was adjusted (see e.g. [here](https://github.com/stackitcloud/stackit-sdk-python/blob/608176ab8cdfa60a3cfb09da49de0b1aba5fea84/services/dns/pyproject.toml))
 - [ ] Examples were added / adjusted (see `examples/` directory)
 - [ ] Unit tests got implemented or updated
 - [x] Unit tests are passing: `make test` (will be checked by CI)