docs(readme): add star call-to-action under the header

Author: fm1320

README.md

@@ -25,6 +25,8 @@
 
 </div>
 
+⭐ _Help us reach more developers and grow the SIE community. Star this repo!_
+
 ## About
 
 SIE is an open-source inference engine that runs the models behind every agent task through one API: search and retrieval, document-to-markdown conversion, structured output, content safety, and the agent loop itself. It replaces the patchwork of a separate model server per task with one system that serves 100+ models, loading each on demand.