Add Documentation Insights and Set ADK as Peer Dependency

[nickchecan]

This pull request introduces a new example agent under examples/my-agent that demonstrates how to use the model-mux package with the Google ADK framework. It also improves documentation and updates dependencies to ensure compatibility with the latest ADK version.

Example agent addition:

• Added a new example agent in examples/my-agent that uses model-mux and Google ADK to provide the current time for a specified city, including a mock tool and agent setup in agent.ts.
• Added a template environment file (.env.template) for OpenAI API key configuration.
• Added a package.json for the example agent with required dependencies and scripts for running and inspecting the agent.

Documentation improvements:

• Added npm version and download badges to the README.md for better package visibility.

Dependency updates:

• Updated the main package.json to use @google/adk version ^0.5.0 as both a devDependency and a peerDependency, ensuring compatibility with the example and core package. [1] [2]

[github-actions]

🎉 This PR is included in version 1.0.5 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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