Updated README.md for build.bat addition

README.md

@@ -24,9 +24,10 @@ The editor can be customized by making changes to the
 [user module](data/user/init.lua).
 
 ## Building
-You can build the project yourself on Linux using the provided `build.sh`
-script. Note that the project does not need to be rebuilt if you are only making
-changes to the Lua portion of the code.
+You can build the project yourself on Linux using the `build.sh` script
+or on Windows using the `build.bat` script *([MinGW](https://nuwen.net/mingw.html) is required)*.
+Note that the project does not need to be rebuilt if you are only making changes
+to the Lua portion of the code.
 
 ## Contributing
 Any additional functionality that can be added through a plugin should be done