docs: add contributing and support sections to README. (#77)

README.md

@@ -177,3 +177,11 @@ docker run -it -p "5433:5433" -p "5133:5133" \
     -e "CONNECTORS=pg1=postgresql://electric:[email protected]:54321/electric;pg2=postgresql://electric:[email protected]:54322/electric" \
     docker.io/library/electric:local-build
 ```
+
+## Contributing
+
+See the [Community Guidelines](https://github.com/electric-sql/meta) including the [Guide to Contributing](https://github.com/electric-sql/meta/blob/main/CONTRIBUTING.md) and [Contributor License Agreement](https://github.com/electric-sql/meta/blob/main/CLA.md).
+
+## Support
+
+We have an [open community Discord](https://discord.gg/B7kHGwDcbj). If you’re interested in the project, please come and say hello and let us know if you have any questions or need any help or support getting things running.