Add `chart-js-rs`

[Billy-Sheppard]

Awesome Contribution Checklist:

• [x] I have read, and re-read the Contributing Guidelines
• [x] I have searched to ensure the suggested item doesn't exist on this list
• [x] This PR contains only one item

Please Describe Your Addition

Hi, I have started developing a Rust API crate for Chartjs to be used with Rust WebAssembly. It is 2+ months old now but only recently published to crates.io. It's also a WIP as currently I am only adding types/fields as required. The repository has an example which should be enough for any users to get started. I think I have formatted everything properly but if not please let me know.

Thanks

[Billy-Sheppard]

@igorlukanin sorry to ping you but you seem to be active in this repo - can this be merged or does it require any further work?

Since my initial PR comment, it has been moved to version 0.0.6 and at least one PR from someone who isn't me has been merged.

Thanks