docs: schema-driven contribution quick start (fixes #167)

[nirbhikneup]

What changed

• Added a brief “Schema-Driven Development (Quick Start)” section to README.
• Clarifies Definitions vs Schemas vs Utilities and links to where to contribute.
• Notes MeshKit version-bump process (ref Bump github.com/layer5io/meshkit from 0.7.50 to 0.7.72 #166).
• Mentions OpenAPI Go codegen with an example link.
• Placeholder for Architecture slides (77–78).

Why

• Addresses onboarding gaps described in [Docs] Schema-driven docs #167 so newcomers know where/how to contribute.

Notes

• DCO signed. Scope kept intentionally small and safe.

Fixes #167

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[gemini-code-assist]

Summary of Changes

Hello @nirbhikneup, 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 significantly enhances the project's README.md by replacing an extensive schema-driven development guide with a concise 'Quick Start' section. The goal is to simplify the onboarding process for new contributors by providing clear, actionable information on how to contribute to schema-driven development, including definitions of key terms, guidance on where to make changes, and a streamlined contribution process. This change directly addresses identified onboarding gaps, making it easier for newcomers to understand and participate in the project.

Highlights

• Documentation Simplification: The primary change involves a significant refactor of the README.md file, replacing a lengthy and detailed 'Schema-Driven Development Guide' with a much more concise and actionable 'Contributing: Schema-Driven Development (Quick Start)' section.
• Improved Contributor Onboarding: The new quick start guide aims to improve the onboarding experience for new contributors by clarifying the distinctions between 'Definitions,' 'Schemas,' and 'Utilities' within the project's schema-driven development approach.
• Clear Contribution Pathways: The updated documentation now explicitly outlines where different types of contributions should be made, providing direct links to the relevant repositories or sections for schemas, the Meshery application, MeshKit, and the documentation website.
• Streamlined Contribution Process: A simplified, 'super short' contribution process is introduced, guiding contributors through the basic steps of making a change, running generators, and opening a pull request.
• Practical Contribution Details: The updated guide includes specific notes on the process for MeshKit version bumps and mentions OpenAPI Go codegen, providing practical details for contributors working with these aspects of the project.

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[gemini-code-assist]

Code Review

This pull request significantly improves the contributor onboarding experience by replacing a lengthy, detailed development guide in the README with a concise "Quick Start" section. The new section effectively directs newcomers to the right places for different types of contributions and provides a clear, high-level process. My main feedback is to correct a hardcoded issue number in the process description to avoid confusion for future contributors. Overall, this is a great change that makes the project more accessible.

[gemini-code-assist]

The issue number #167 is specific to this pull request. To make this a generic instruction for all future contributors, please replace it with a placeholder like #<issue-number>.

Suggested change

	3. Open a PR with DCO and include `Fixes #167`.
	3. Open a PR with DCO and include `Fixes #<issue-number>`.

[nirbhikneup]

@leecalcote