Update README.md

Signed-off-by: Hendrik Ebbers <hendrik.ebbers@web.de>

README.md

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 # Hedera Gradle Conventions
 
 Gradle convention plugins used by Hiero projects.
+
+## Contributing
+
+Whether you’re fixing bugs, enhancing features, or improving documentation, your contributions are important — let’s build something great together!
+
+Please read our [contributing guide](https://github.com/hiero-ledger/.github/blob/main/CONTRIBUTING.md) to see how you can get involved.
+
+## Code of Conduct
+
+Hiero uses the Linux Foundation Decentralised Trust [Code of Conduct](https://www.lfdecentralizedtrust.org/code-of-conduct).
+
+## License
+
+[Apache License 2.0](LICENSE)