Add Rust tutorial about writing a chat service.

Add "Rust in Detail: Writing Scalable Chat Service from Scratch"
tutorial by [Nikita Baksalyar](https://github.com/nbaksalyar).

Author: bobeff

README.md

@@ -250,6 +250,9 @@ To get started, simply fork this repo. Please refer to [CONTRIBUTING.md](CONTRIB
 * [Build a browser engine in Rust](https://limpet.net/mbrubeck/2014/08/08/toy-layout-engine-1.html)
 * [Write a Microservice in Rust](http://www.goldsborough.me/rust/web/tutorial/2018/01/20/17-01-11-writing_a_microservice_in_rust/)
 * [Learning Rust with Too Many Linked Lists](http://cglab.ca/~abeinges/blah/too-many-lists/book/README.html)
+* Rust in Detail: Writing Scalable Chat Service from Scratch
+  * [Part 1: Implementing WebSocket. Introduction.](https://nbaksalyar.github.io/2015/07/10/writing-chat-in-rust.html)
+  * [Part 2: Sending and Receiving Messages](https://nbaksalyar.github.io/2015/11/09/rust-in-detail-2.html)
 
 ## Swift: