Add ASP.NET Core build system

build.cmd

@@ -0,0 +1,40 @@
+@echo off
+cd %~dp0
+
+SETLOCAL
+SET NUGET_VERSION=latest
+SET CACHED_NUGET=%LocalAppData%\NuGet\nuget.%NUGET_VERSION%.exe
+SET BUILDCMD_KOREBUILD_VERSION=
+SET BUILDCMD_DNX_VERSION=
+
+IF EXIST %CACHED_NUGET% goto copynuget
+echo Downloading latest version of NuGet.exe...
+IF NOT EXIST %LocalAppData%\NuGet md %LocalAppData%\NuGet
+@powershell -NoProfile -ExecutionPolicy unrestricted -Command "$ProgressPreference = 'SilentlyContinue'; Invoke-WebRequest 'https://dist.nuget.org/win-x86-commandline/%NUGET_VERSION%/nuget.exe' -OutFile '%CACHED_NUGET%'"
+
+:copynuget
+IF EXIST .nuget\nuget.exe goto restore
+md .nuget
+copy %CACHED_NUGET% .nuget\nuget.exe > nul
+
+:restore
+IF EXIST packages\Sake goto getdnx
+IF "%BUILDCMD_KOREBUILD_VERSION%"=="" (
+    .nuget\nuget.exe install KoreBuild -ExcludeVersion -o packages -nocache -pre
+) ELSE (
+    .nuget\nuget.exe install KoreBuild -version %BUILDCMD_KOREBUILD_VERSION% -ExcludeVersion -o packages -nocache -pre
+)
+.nuget\NuGet.exe install Sake -ExcludeVersion -Source https://www.nuget.org/api/v2/ -Out packages
+
+:getdnx
+IF "%BUILDCMD_DNX_VERSION%"=="" (
+    SET BUILDCMD_DNX_VERSION=latest
+)
+IF "%SKIP_DNX_INSTALL%"=="" (
+    CALL packages\KoreBuild\build\dnvm install %BUILDCMD_DNX_VERSION% -runtime CoreCLR -arch x86 -alias default
+    CALL packages\KoreBuild\build\dnvm install default -runtime CLR -arch x86 -alias default
+) ELSE (
+    CALL packages\KoreBuild\build\dnvm use default -runtime CLR -arch x86
+)
+
+packages\Sake\tools\Sake.exe -I packages\KoreBuild\build -f makefile.shade %*