Update README.md with struct compilation from Rust to Typescript example

[monstaflame]

I've just discovered this nice crate. There is one thing that made me pause, there is no example of Typescript that the crate would generate.

My suggestion / request is adding the example below in the README.md (I'm taking the current content of the section and add what I would like to add) :

use ts_rs::TS;

#[derive(TS)]
#[ts(export)]
struct User {
   user_id: i32,
   first_name: String,
   last_name: String,
}

When running cargo test, the TypeScript bindings will be exported to the file bindings/User.ts.

interface User {
   userId: number,
   firstName: string,
   lastName: string,
}

Something like that.

[NyxCode]

Maybe we can (also?) commit the bindings generated by the example?

[monstaflame]

Yes it would be great !