docs: add getting started section to README

README.md

@@ -1,3 +1,27 @@
 # airthings-ble
 
-Library to control Airthings devices through BLE, primarily meant to be used in Home Assistant.
+Library to control Airthings devices through BLE, primarily meant to be used in
+the [Home Assistant integration](https://www.home-assistant.io/integrations/airthings_ble/).
+
+## Getting Started
+
+Prerequisites:
+
+- [Python 3.7.2+](https://www.python.org/downloads/)
+- [Poetry](https://python-poetry.org/docs/#installation)
+
+Install dependencies:
+
+```bash
+poetry install
+```
+
+Run tests:
+
+```bash
+poetry run pytest
+```
+
+## License
+
+This project is licensed under the MIT License. See the [LICENSE](LICENSE) file for details.