Add .gitignore for adk-go

[git-hulk]

Add .gitignore for the project to allow excluding unexpected directories. Just imported and changed a few lines from https://github.com/google/go-github.

[gemini-code-assist[bot]]

Summary of Changes

Hello @git-hulk, I'm Gemini Code Assist[^1]! 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 introduces a .gitignore file to the adk-go project. Its primary purpose is to establish a clear set of rules for files and directories that should not be tracked by Git, thereby maintaining a clean repository and preventing the accidental inclusion of build artifacts, temporary files, or local development configurations. This improves project hygiene and consistency across development environments.

Highlights

• New .gitignore file: A new .gitignore file has been added to the project root to specify files and directories that should be ignored by Git.
• Comprehensive Go exclusions: The .gitignore includes patterns for common Go build artifacts (e.g., *.exe, *.dll, *.so, *.dylib), test binaries (*.test), code coverage profiles (*.out, coverage.*, *.coverprofile, profile.cov), and Go workspace files (go.work, go.work.sum).
• Development environment exclusions: It also incorporates patterns to ignore development environment-specific files such as vendor/ directories, .env files, IDE/editor configuration directories (.idea/, .vscode, .claude/), macOS specific files (.DS_Store), and vim temporary files (*.swp).
• Origin of patterns: The patterns are largely inspired by the .gitignore used in the google/go-github project, with minor adjustments.

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