docs(readme): add Socket Badge to README

Add Socket security badge alongside CI and coverage badges to match socket-lib style.

Author: jdalton

README.md

@@ -1,6 +1,7 @@
 # @socketregistry
 
-[![CI - SocketDev/socket-registry](https://github.com/SocketDev/socket-registry/actions/workflows/_local-not-for-reuse-ci.yml/badge.svg)](https://github.com/SocketDev/socket-registry/actions/workflows/_local-not-for-reuse-ci.yml)
+[![Socket Badge](https://socket.dev/api/badge/npm/package/@socketsecurity/registry)](https://socket.dev/npm/package/@socketsecurity/registry)
+[![CI](https://github.com/SocketDev/socket-registry/actions/workflows/_local-not-for-reuse-ci.yml/badge.svg)](https://github.com/SocketDev/socket-registry/actions/workflows/_local-not-for-reuse-ci.yml)
 ![Coverage](https://img.shields.io/badge/coverage-99.10%25-brightgreen)
 
 [![Follow @SocketSecurity](https://img.shields.io/twitter/follow/SocketSecurity?style=social)](https://twitter.com/SocketSecurity)