Add ASP.NET Core build system

build.sh

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+
+if test `uname` = Darwin; then
+    cachedir=~/Library/Caches/KBuild
+else
+    if [ -z $XDG_DATA_HOME ]; then
+        cachedir=$HOME/.local/share
+    else
+        cachedir=$XDG_DATA_HOME;
+    fi
+fi
+mkdir -p $cachedir
+nugetVersion=latest
+cachePath=$cachedir/nuget.$nugetVersion.exe
+
+url=https://dist.nuget.org/win-x86-commandline/$nugetVersion/nuget.exe
+
+if test ! -f $cachePath; then
+    wget -O $cachePath $url 2>/dev/null || curl -o $cachePath --location $url /dev/null
+fi
+
+if test ! -e .nuget; then
+    mkdir .nuget
+    cp $cachePath .nuget/nuget.exe
+fi
+
+if test ! -d packages/Sake; then
+    mono .nuget/nuget.exe install KoreBuild -ExcludeVersion -o packages -nocache -pre
+    mono .nuget/nuget.exe install Sake -ExcludeVersion -Source https://www.nuget.org/api/v2/ -Out packages
+fi
+
+if ! type dnvm > /dev/null 2>&1; then
+    source packages/KoreBuild/build/dnvm.sh
+fi
+
+if ! type dnx > /dev/null 2>&1 || [ -z "$SKIP_DNX_INSTALL" ]; then
+    dnvm install latest -runtime coreclr -alias default
+    dnvm install default -runtime mono -alias default
+else
+    dnvm use default -runtime mono
+fi
+
+mono packages/Sake/tools/Sake.exe -I packages/KoreBuild/build -f makefile.shade "$@"