add initial Python API setup using uv init and README with short desc.

Add README with short description of the desired state.

README.md

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+# Dooris
+
+Dooris setup using HomeMatic with Web UI, API and OIDC integration.  
+Based on prior work of [hmdooris](https://git.hamburg.ccc.de/CCCHH/hmdooris).
+
+Project structure:
+
+```
+├── api # Python application interacting with HomeMatic and providing the API.
+└── app # Web UI
+```

api/.python-version

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+3.14

api/main.py

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+def main():
+    print("Hello from api!")
+
+
+if __name__ == "__main__":
+    main()

api/pyproject.toml

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+[project]
+name = "dooris_api"
+version = "0.1.0"
+description = "API for Dooris setup using HomeMatic."
+requires-python = ">=3.14"
+dependencies = []