Update README.md

Author: EashanKaushik

src/InlineAgent/examples/mcp/mcp_sse/README.md

@@ -4,6 +4,10 @@
   <a href="https://github.com/aarora79/aws-cost-explorer-mcp-server"><img src="https://img.shields.io/badge/Github-aws_cost_explorer_mcp_server-blue" /></a>
 </p>
 
+> [!IMPORTANT]
+> Never expose AWS keys publicly, use least privilege IAM roles, and rotate credentials every 90 days. Utilize AWS Secrets Manager, implement MFA, avoid hard-coding credentials, and continuously monitor access.
+
+
 > [!NOTE]  
 >  Soon HTTP+SSE will be replaces with new "Streamable HTTP", see PR [here](https://github.com/modelcontextprotocol/specification/pull/206).