Added Windows build script and documentation

Author: darksylinc

README.md

@@ -44,9 +44,14 @@ cd ../../bin/Release
 
 ### Windows
 
-TBD.
-Build works on VS2019. CMake generation, but it will complain about SDL2 due to poorly setup sdl2-config.cmake.
-You'll need to setup the paths to SDL2 by hand.
+Double click on build_Visual_Studio_16_2019_x64.bat
+
+If you want to use another target edit the beginning of the bat script, or manually:
+
+1. Point CMake source to %bety_repo_path%
+1. Point CMake generation path to %bety_repo_path%/build
+
+Build tested on VS2019.
 
 ### Python scripts
 

build_Visual_Studio_16_2019_x64.bat

@@ -0,0 +1,36 @@
+
+@echo off
+SETLOCAL
+
+set GENERATOR="Visual Studio 16 2019"
+set PLATFORM=x64
+
+set CMAKE_BIN_x86="C:\Program Files (x86)\CMake\bin\cmake.exe"
+set CMAKE_BIN_x64="C:\Program Files\CMake\bin\cmake.exe"
+IF EXIST %CMAKE_BIN_x64% (
+	echo CMake 64-bit detected
+	set CMAKE_BIN=%CMAKE_BIN_x64%
+) ELSE (
+	IF EXIST %CMAKE_BIN_x86% (
+		echo CMake 32-bit detected
+		set CMAKE_BIN=%CMAKE_BIN_x86%
+	) ELSE (
+		echo Cannot detect either %CMAKE_BIN_x86% or
+		echo %CMAKE_BIN_x64% make sure CMake is installed
+		EXIT /B 1
+	)
+)
+echo Using CMake at %CMAKE_BIN%
+
+mkdir build
+cd build
+echo --- Building betsy ---
+%CMAKE_BIN% -G %GENERATOR% -A %PLATFORM% ..
+%CMAKE_BIN% --build . --config Debug
+%CMAKE_BIN% --build . --target install --config Debug
+%CMAKE_BIN% --build . --config Release
+%CMAKE_BIN% --build . --target install --config Release
+
+echo Done!
+
+ENDLOCAL