feat: add readme to denoland

[WilliamBergamin]

Summary

This PR aim to allow denoland to display the readme.md from this repository while maintaining a single source of truth for the readme

Testing

Test this out from this branch

Special notes

This change moves the README.md content to src/README.md and creates a symbolic link between README.md and src/README.md, this makes src/README.md the source of truth but allows GitHub to properly render the README.md file

I took this approach from the next.js project

Feedback

• Is this something we want to implement?
• Is there a simpler way to do this?
• Could this cause confusion in the future?

Requirements

• [x] I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• [x] I've read and agree to the Code of Conduct.
• [x] I've ran deno task test after making the changes.