Added link to Windows build environment guide.

README.md

@@ -76,6 +76,8 @@ Then the ideal setup for development is:
 
 For generic Linux systems you can follow [this guide](https://github.com/browsh-org/browsh/blob/master/contrib/setup_linux_build_environment.md) on how to setup a build environment, that you may be able to adapt for other systems as well.
 
+Windows users can follow [this guide](https://github.com/browsh-org/browsh/blob/master/contrib/setup_windows_build_environment.md) in order to set up a build environment.
+
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