doc: update readme to include build badge

Author: manusa

README.md

@@ -1,4 +1,17 @@
+# Kubernetes MCP Server
 
+<p align="center">
+  <a href="https://github.com/manusa/kubernetes-mcp-server/actions/workflows/build.yaml">
+    <img src="https://github.com/manusa/kubernetes-mcp-server/actions/workflows/build.yaml/badge.svg" alt="Build status badge" />
+  </a>
+</p>
+
+
+<p align="center">
+  <a href="#features">Features</a>
+</p>
+
+## Features <a id="features" />
 
 ## Notes