Updated Contributing, Added CoC to Readme

Updated the Contributing guidelines and added Code of Conduct for the W3C Solid CG.

README.md

@@ -2,12 +2,19 @@
 
 Solid-PREP defines representation and semantics for notifications sent from [LDP Resources](https://www.w3.org/TR/ldp/#ldpr) hosted on **[Solid](https://solidproject.org) PODS** using the **[Per Resource Events](https://cxres.github.io/prep/draft-gupta-httpbis-per-resource-events.html)** Protocol.
 
-## Participation
-
-All are welcome to contribute by opening an issue or a pull request to the Solid-PREP [repository](https://github.com/CxRes/solid-prep). We will, however, only be able to accept contributions once an open source license is finalized.
-
 ## Protocol
 
 **Solid-PREP** is available from the following URLs:
 
 * Editors Draft: <https://solid.github.io/solid-prep/protocol/>
+
+## Contributing
+
+Feel free to contribute to Solid-PREP by opening an issue or a pull request to the Solid-PREP [repository](https://github.com/CxRes/solid-prep).
+For detailed instructions, please refer to the W3C Solid CG's [contributing guide](https://github.com/w3c-cg/solid/blob/main/CONTRIBUTING.md).
+
+All contributors must be members of the W3C Solid Community Group. Joining the W3C Solid CG is easy; if you'd like to contribute, you can [join here](https://www.w3.org/community/solid/join).
+
+## Code of Conduct
+
+All work and communication within the W3C Solid CG are governed by the [Solid Code of Conduct](https://github.com/solid/process/blob/main/code-of-conduct.md) and the [Positive Work Environment at W3C: Code of Ethics and Professional Conduct](https://www.w3.org/policies/code-of-conduct/).