Add README.md with project description

[Copilot]

Adds documentation for this Google ADK AI Agents experimentation repository.

Changes

• Created README.md with:
  • Repository description (AI Agents architecture using Google ADK)
  • Overview of explored models and API calls, including Google search capabilities
  • Image placeholder for agent debugging UI

![Agent Debugging UI](agent_debugging_ui.png)

Original prompt

Create a README.md file in the root of the repository.
The README.md should contain the following information:

• A description stating that this repository contains experimentations with AI Agents architecture built using Google ADK.
• An explanation that the files explore various models and API calls to the Google ADK to give the agents various abilities, specifically mentioning the ability to google search relevant topics.
• Include the image provided to demonstrate the agent debugging UI. Use the exact reference:

This pull request was created as a result of the following prompt from Copilot chat.

Create a README.md file in the root of the repository.
The README.md should contain the following information:

• A description stating that this repository contains experimentations with AI Agents architecture built using Google ADK.
• An explanation that the files explore various models and API calls to the Google ADK to give the agents various abilities, specifically mentioning the ability to google search relevant topics.
• Include the image provided to demonstrate the agent debugging UI. Use the exact reference:

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