add links to extensions in readme

Author: aaronpk

README.md

@@ -9,6 +9,12 @@ These extensions are:
 - **Composable** - Extensions are modular and designed to work together without conflicts, allowing implementations to adopt multiple extensions simultaneously
 - **Versioned independently** - Extensions follow the core MCP versioning cycle but may adopt independent versioning as needed
 
+## Extensions
+
+* [Client Credentials](https://github.com/modelcontextprotocol/ext-auth/blob/main/specification/draft/oauth-client-credentials.mdx)
+* [Enterprise-Managed Authorization](https://github.com/modelcontextprotocol/ext-auth/blob/main/specification/draft/enterprise-managed-authorization.mdx)
+
+
 ## Governance
 
 This repository follows the [Model Context Protocol Governance](https://modelcontextprotocol.io/community/governance) process, with a dedicated set of maintainers for authorization extensions. See [MAINTAINERS.md](./MAINTAINERS.md) for the list of maintainers specific to this repository.