Update README.md

Author: polina-c

README.md

@@ -1,4 +1,8 @@
-# Flutter Coding Agent
+# GenUI SDK
+
+An SDK to create agentive applications.
+
+## Flutter Coding Agent
 
 A tool using GenKit to generate Flutter code using an agentic framework.
 
@@ -8,4 +12,4 @@ application's architecture, create an implementation plan, and generate the
 corresponding Dart code.
 
 See the agent [README.md](./agent/README.md) for information about running the
-agent.
+agent.