Update documentation for the genui implemention - 'Getting Started wi… (#573)

Author: bjorndonald

packages/genui/CHANGELOG.md

@@ -1,6 +1,7 @@
 # `genui` Changelog
 
 ## 0.5.2 (in progress)
+- Updated README sample code to reflect current `FirebaseAiContentGenerator` API (added `catalog` parameter and replaced `tools` with `additionalTools`).
 
 ## 0.5.1
 

packages/genui/README.md

@@ -169,12 +169,12 @@ provider.
        // Create a ContentGenerator to communicate with the LLM.
        // Provide system instructions and the tools from the GenUiManager.
        final contentGenerator = FirebaseAiContentGenerator(
+         catalog: CoreCatalogItems.asCatalog(),
          systemInstruction: '''
            You are an expert in creating funny riddles. Every time I give you a word,
            you should generate UI that displays one new riddle related to that word.
            Each riddle should have both a question and an answer.
            ''',
-         tools: _genUiManager.getTools(),
        );
 
        // Create the GenUiConversation to orchestrate everything.