Update README with build instructions for Windows

Added Windows build instructions and improved formatting.

Author: desertkun

Readme.md

@@ -1,13 +1,15 @@
-# FuseX - Fuse Emulator Fork for macOS
+# FuseX - Fuse Emulator Fork
 
-This is a fork of Fuse (the Free Unix Spectrum Emulator) for macOS, originally forked from [Fuse for macOS](https://sourceforge.net/p/fuse-for-macosx/fuse-for-macos) on SourceForge.
+This is a fork of Fuse (the Free Unix Spectrum Emulator), originally forked from [Fuse for macOS](https://sourceforge.net/p/fuse-for-macosx/fuse-for-macos) on SourceForge.
 
 This fork is maintained for [speccytools](https://github.com/speccytools).
 
 See [README](./README) for original instructions.
 
 ## Requirements
 
+### On Mac
+
 To build, do
 
 ```bash
@@ -19,3 +21,11 @@ To switch xcodebuild to use XCode, and then do
 ```bash
 make
 ```
+
+### On Windows
+
+Install MINGW64, do
+
+```
+./build_win32.sh
+```