Cheatsheet / translation table

[Bromeon]

It was brought up on Discord that sometimes, it's not clear how an existing GDScript concept maps to Rust. This is especially true for all the domain-specific syntax, like $Node, export, etc.

The format could be a simple table with a left column GDScript and a right one Rust. This would not replace the tutorial parts of the book, as it wouldn't contain explanations (except maybe very brief ones). Deeper explanations of concepts should be elsewhere. If the table grows, it could be split in separate tables depending on category.