Genkit MCP

#Genkit This is a simple demonstration web app using the [Genkit Library](https://github.com/firebase/genkit) with Gemini to characters for an adventure game. In IDX, get started by with API key at https://g.co/ai/idxGetGeminiKey and enter it in `.idx/dev.nix` and rebuild the environment. After rebuilding the environment, open a new terminal (`Ctrl`+ `` ` ``) and follow the link that said "Genkit Developer UI" to use Genkit's built-in local developer playground.