fixed sqlAlchemy and db connection

Co-authored-by: Tristan Nolde <TrisNol@users.noreply.github.com>

CONTRIBUTING.md

@@ -35,6 +35,16 @@ We decided to use english on everything close to code but will write longer text
       - python normen ([pep8](https://peps.python.org/pep-0008/)) with [flake8](https://flake8.pycqa.org/en/latest/)
       - type checking with ([mypy](https://github.com/python/mypy))
 
+- Install [Python 3.11](https://www.python.org/downloads/release/python-3111/)
+- Install Poetry
+```
+pip install poetry
+```
+- Install dependencies
+```
+poetry install
+```
+
 ## Setup
 
 ### Connection strings