Update GettingStarted.md

Author: tritao

docs/GettingStarted.md

@@ -55,8 +55,11 @@ debug configuration, which will be too slow for practical use beyond debugging.
 
 ## Compiling on macOS or Linux
 
+The following steps should be called from the VS developer command prompt.
+
 1. Generate the VS solution and makefiles 
 
+
     ```shell
     cd <CppSharp>\build
     ./build.sh generate -configuration Release -platform x64