Add notes on procuring Visual Studio

[no_ci]

Author: atruskie

CONTRIBUTING.md

@@ -29,7 +29,9 @@ Required Software
 The required software for developing new code (not running the program) includes:
 
 - A Windows OS (we're working on making this Linux compatible)
-- Visual Studio 2017
+- Visual Studio 2019
+  - If you're at a university you can software from https://azureforeducation.microsoft.com/devtools
+  - The [community edition](https://visualstudio.microsoft.com/vs/) of Visual Studio should work fine and is totally free
 - [Optional] Resharper Ulitmate (Academic License)
   - Install these plugins (_ReSharper_ menu > _Extension Manager_)
     - ReSpeller Free