add license section to README.md

Author: hackpulsar

README.md

@@ -32,4 +32,8 @@ src/
 See the [docs](docs/) directory for detailed documentation:
 - [API Reference](docs/api.md)
 - [Configuration](docs/config.md)
-- [Deployment](docs/deployment.md)
+- [Deployment](docs/deployment.md)
+
+## License
+
+Apache 2.0 License - see [LICENSE](LICENSE)