Add Comprehensive Rust course by Google (#10467)

courses/free-courses-en.md

@@ -1454,6 +1454,7 @@
 
 ### Rust
 
+* [Comprehensive Rust](https://google.github.io/comprehensive-rust/index.html) - Google
 * [Intro to Rust](https://www.youtube.com/playlist?list=PLJbE2Yu2zumDF6BX6_RdPisRVHgzV02NW) - Tensor Programming
 * [Learn Rust from scratch](https://www.educative.io/courses/learn-rust-from-scratch) - Educative.io
 * [Rust Basics](https://www.youtube.com/playlist?list=PLlcnQQJK8SUjApd95LIcd3K9XXmE-IeCS) - Engineer Man