Add documentation (#287)

* Add crate documentation

* Use full path intead of relative path

* Add documentation to core/document/src/color.rs

* Add modification by

* Add @Keavon's modification

* @Keavon's changes

* remove useless let

Co-authored-by: TrueDoctor <dennis@kobert.dev>

client/web/wasm/src/lib.rs

@@ -1,3 +1,6 @@
+//! **Rust WebAssembly wrapper**: `/client/web/wasm/`  
+//! Wraps the Editor Core Library and provides an API for the web app to use unburdened by Rust's complex data types that are not supported by WASM
+
 pub mod document;
 mod shims;
 pub mod utils;