docs: Add reference on how to use secrets.json

CONTRIBUTING.md

@@ -34,3 +34,27 @@ We decided to use english on everything close to code but will write longer text
       - Secret detection
       - 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))
+
+## Setup
+
+### Connection strings
+Create a `secrets.json` in the root of this repo with the following structure (values to be replaces by desired config):
+```json
+   {
+    "postgres": {
+      "username": "postgres",
+      "password": "postgres",
+      "host": "localhost",
+      "database": "postgres",
+      "port": 5432
+    },
+    "mongo": {
+      "username": "username",
+      "password": "password",
+      "host": "localhost",
+      "database": "transparenzregister",
+      "port": 27017
+    }
+  }
+```
+Example usage see [connector.py](./src/aki_prj23_transparenzregister/utils/postgres/connector.py)

docker-compose.yml

@@ -5,5 +5,23 @@ services:
     restart: always
     environment:
       POSTGRES_PASSWORD: postgres
+    volumes:
+    - postgres_data:/var/lib/postgresql/data
     ports:
     - 5432:5432
+  mongodb:
+    image: mongo:4.4.6
+    container_name: mongodb
+    restart: unless-stopped
+    environment:
+      MONGO_INITDB_ROOT_USERNAME: username
+      MONGO_INITDB_ROOT_PASSWORD: password
+      MONGO_INITDB_DATABASE: transparenzregister
+    ports:
+    - 27017:27017
+    volumes:
+    - mongo_data:/data/db
+
+volumes:
+  postgres_data:
+  mongo_data: