docs: add commits doc to contributing guide

[susanshi]

Description

What this PR does / why we need it:

PR contains the below changes to the contributing guide

1.added table of content
2.added a section for Commits ( verbiage from notary project)
3.add a youtube link for vscode debug recording

Checklist:

• Does the affected code have corresponding tests?
• Are the changes documented, not just with inline documentation, but also with conceptual documentation such as an overview of a new feature, or task-based documentation like a tutorial? Consider if this change should be announced on your project blog.
• Does this introduce breaking changes that would require an announcement or bumping the major version?
• Do all new files have appropriate license header?

Post Merge Requirements

• MAINTAINERS: manually trigger the "Publish Package" workflow after merging any PR that indicates Helm Chart Change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅