Update title + desc and add badges

[atesgoral]

1. Update the title and description in README to match what's in the gemspec file and to align with other SDKs in this org.
2. Add Gem version badge
3. Add MIT license badge

Motivation and Context

💅 Consistency. And now we can have a version badge because v0.1.0 out!

How Has This Been Tested?

N/A

Breaking Changes

No.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Documentation update

Checklist

• [ ] I have read the MCP Documentation
• [ ] My code follows the repository's style guidelines
• [ ] New and existing tests pass locally
• [ ] I have added appropriate error handling
• [x] I have added or updated documentation as needed

Additional context