(doc,chore) added readme, pin python version

README.md

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+# Simple Notification Forwarding Application
+
+This Application is a simple REST-API for forwarding notifications.
+
+## Preperations for Virtual Environment
+
+```bash
+git clone https://git.n-schuler.dev/nicolas/challenge_cloud_accelerator.git
+cd challenge_cloud_accelerator
+uv venv .venv && source .venv/bin/activate
+uv sync
+```
+
+## Usage
+
+```bash
+  fastapi run app/main.py
+```
+
+## Testing
+```bash
+  source .venv/bin/activate
+  pytest
+```
+
+## Documentation
+
+The OpenAPI Documentation is available at `0.0.0.0:8000/docs`.