Add information about MinGW

Author: MahBoiDeveloper

README.md

@@ -4,9 +4,10 @@ GZHHotkeysEditor is an attempt to create a useful tool for editing C&C: Generals
 
 ## Building manually
 0. Download and install [Qt 5.15.2](https://www.qt.io/offline-installers) to the `C:\Qt` folder
-1. Download and install [CMake 3.15](https://cmake.org/download/) or newer
-2. Clone this repository recursively via your git client
-3. Run `zBuild.bat` or run build in your favourite editor
+1. Download and install [MinGW_w64 8.1.0](https://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win64/Personal%20Builds/mingw-builds/8.1.0/threads-win32/sjlj/x86_64-8.1.0-release-win32-sjlj-rt_v6-rev0.7z/download) to the `C:\Qt\Tools\mingw810_64` folder
+2. Download and install [CMake 3.15](https://cmake.org/download/) or newer
+3. Clone this repository recursively via your git client
+4. Run `zBuildAndRun.bat` or run build in your favourite editor
 
 ## Future features
 * C&C: Generals — Zero Hour support