Improved README: resource descriptions, platform table

[rohit2143]

Description

This PR updates the README to improve clarity and usability for new users.
Changes include:

• Added a clear and structured Supported Platforms table.
• Expanded the Resources Overview section with brief descriptions of each resource.
• Improved readability and organization of documentation sections.

These changes are documentation-only and do not modify cookbook functionality.

Issues Resolved

• N/A — documentation improvement.
  (If linking to an issue, replace with: Closes #<issue-number>.)

Check List

• [ ] All commit messages follow Conventional Commits format
  • Example used: docs: update resource descriptions and add platform table in README
• [ ] New functionality includes testing (N/A)
• [ ] New functionality has been documented in the README if applicable

⚠️ Important: Automated Release Workflow

DO NOT manually edit these files:

• ❌ metadata.rb version
• ❌ CHANGELOG.md
• ❌ Git tags

All are handled automatically by release-please.

Release process:

1. Merge PR → release-please opens a release PR
2. Merge release PR → version bump + changelog update + publish
3. Documentation changes will be included in the next release 🎉

Need help with Conventional Commits?
See: https://www.conventionalcommits.org/