docs(readme): add link to Rust setup guide

Author: incognitojam

README.md

@@ -1,6 +1,9 @@
 # game-rs
 ## Development
 ### Requirements
+Followed the guide [here](http://nercury.github.io/rust/opengl/tutorial/2018/02/08/opengl-in-rust-from-scratch-00-setup.html#setup-for-rust-development)
+for setting up a Rust development environment.
+
 - `libsdl2-dev`
 
 ### Usage