docs(readme): add Getting Started section

[bmahabirbu]

Summary

• Adds a "Getting Started" section to the README with prerequisites, build, run, install, and test instructions
• Placed between the Introduction and Glossary sections for easy discoverability

Test plan

• Verify make build command works as documented
• Verify make test command works as documented
• Review README renders correctly on GitHub

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 40190a0e-5cf9-4a69-820f-b5c7bafb4273

📥 Commits

Reviewing files that changed from the base of the PR and between 7029441 and fa2128b.

📒 Files selected for processing (1)

• README.md

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[bmahabirbu]

Just thought for any new go users this might be helpful!

[feloy]

thanks, LGTM