Add link to build config fork to readme (#67)

README.md

@@ -40,9 +40,12 @@ The user guide and API documentation are available on [GitHub Pages](https://nvi
 
 Please see instructions specific to each of the libraries in the respective subfolder.
 
+## Community-Maintained Build Configuration Fork
+
+Please see [the O3DE Fork](https://github.com/o3de/PhysX) for community-maintained additional build configurations.
+
 ## Support
 
 * Please use GitHub [Discussions](https://github.com/NVIDIA-Omniverse/PhysX/discussions/) for questions and comments.
 * GitHub [Issues](https://github.com/NVIDIA-Omniverse/PhysX/issues) should only be used for bug reports or documentation issues.
 * You can also ask questions in the NVIDIA Omniverse #physics [Discord Channel](https://discord.com/invite/XWQNJDNuaC).
-