docs: add pointer to contributing guide in README (kgateway-dev#11126)

Signed-off-by: Craig Rodrigues <[email protected]>

Author: rodrigc

README.md

@@ -29,6 +29,8 @@ The project was previously known as Gloo, and has been [production-ready since 2
 - [Learn more about the community](https://github.com/kgateway-dev/community)
 
 ## Contributing to kgateway
+Please refer to the [contributing guide](https://github.com/kgateway-dev/community/blob/main/CONTRIBUTING.md) in the community repo.
+
 The [devel](devel) folder should be the starting point for understanding the code, and contributing to the product.
 
 ## Thanks
@@ -42,4 +44,4 @@ Kgateway would not be possible without the valuable open source work of projects
 <div align="center">
     <img src="https://raw.githubusercontent.com/cncf/artwork/main/other/cncf-sandbox/horizontal/color/cncf-sandbox-horizontal-color.svg" width="300" alt="Cloud Native Computing Foundation logo"/>
     <p>kgateway is a <a href="https://cncf.io">Cloud Native Computing Foundation</a> sandbox project.</p>
-</div>
+</div>