Update Agent Evals README for Templates and Mocks

[samedson]

Description

Adds more info to template instructions

[gemini-code-assist]

Summary of Changes

Hello @samedson, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the documentation for agent evaluations by providing comprehensive instructions on how to utilize templates and tool mocks. These additions will enable developers to more easily configure their testing environments with pre-existing project structures and simulate external tool interactions, streamlining the development and testing workflow for agents.

Highlights

• Updated startAgentTest example: The example for startAgentTest now includes templateName and toolMocks parameters, demonstrating how to configure specific testing environments and mock external tools.
• Added 'Adding Templates' section: A new section provides detailed instructions on how to create and integrate custom templates for agent evaluations, covering folder structure, index.ts updates, .gitignore considerations, and TemplatePlatform configuration.

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[gemini-code-assist]

Code Review

This pull request updates the README.md for agent evaluations, providing new instructions for using templates and mocks. The code example for writing tests has been updated to demonstrate these new features, and a new section on 'Adding Templates' has been included. These changes make the documentation more comprehensive and useful. My review includes a couple of minor suggestions to fix grammatical and stylistic issues in the new documentation to enhance clarity.