chore: Add Go ADK link to README

The README now includes a link to the `adk-go` GitHub repository.

Co-authored-by: Hangfei Lin <hangfei@google.com>
PiperOrigin-RevId: 830971424

Author: hangfei

README.md

@@ -17,7 +17,8 @@
       Important Links:
       <a href="https://google.github.io/adk-docs/">Docs</a>,
       <a href="https://github.com/google/adk-samples">Samples</a>,
-      <a href="https://github.com/google/adk-java">Java ADK</a> &
+      <a href="https://github.com/google/adk-java">Java ADK</a>,
+      <a href="https://github.com/google/adk-go">Go ADK</a> &
       <a href="https://github.com/google/adk-web">ADK Web</a>.
     </h3>
 </html>