chore: add Dev ui dependency and update version to 0.2.0

Signed-off-by: shown.Ji <[email protected]>

Author: yuluo-yx

README.md

@@ -48,7 +48,13 @@ If you're using Maven, add the following to your dependencies:
 <dependency>
   <groupId>com.google.adk</groupId>
   <artifactId>google-adk</artifactId>
-  <version>0.1.0</version>
+  <version>0.2.0</version>
+</dependency>
+<!-- Dev UI -->
+<dependency>
+    <groupId>com.google.adk</groupId>
+    <artifactId>google-adk-dev</artifactId>
+    <version>0.2.0</version>
 </dependency>
 ```