Merge pull request #965 from warycat/master

Add Rust Gym to learning

README.md

@@ -1550,6 +1550,7 @@ A registry allows you to publish your Rust libraries as crate packages, to share
   * [Shipping a Solid Rust Crate](https://www.youtube.com/watch?v=t4CyEKb-ywA) — Presented by [Michael Gattozzi](https://github.com/mgattozzi) @ RustConf 2017
   * [Rust: Hack Without Fear!](https://www.youtube.com/watch?v=lO1z-7cuRYI) — Presented by [Nicholas Matsakis](https://github.com/nikomatsakis) @ C++Now 2018
 * Learning
+  * [Rust Gym](https://github.com/warycat/rustgym) - A big collection of coding interview problems solved in Rust.
   * [Programming Community Curated Resources for Learning Rust](https://hackr.io/tutorials/learn-rust) — A list of recommended resources voted by the programming community.
   * [awesome-rust-mentors](https://rustbeginners.github.io/awesome-rust-mentors/) — A list of helpful Rust mentors willing to take mentees and eductate them about Rust and programming.
   * [Awesome Rust Streaming](https://github.com/jamesmunns/awesome-rust-streaming) - A community curated list of livestreams about Rust.