[Docs] Update readme with description of extension

[marblom007]

Current State

Desired State

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Contributor Guides and Handbook

• 📚 Instructions for contributing to documentation
  • Meshery documentation site and source
• 🛠 Meshery Build & Release Strategy
• 🎨 Wireframes and designs for Meshery UI in Figma (open invite)
• 🙋🏾🙋🏼 Questions: Discussion Forum and Community Slack

[marblom007]

@M-DEV-1 are you able to do this well?

[M-DEV-1]

@marblom007 Yes 👍, I'll also take help as and when needed.