Added a README file regarding WinRT support

To note, this file is currently formatted with CRLF line endings, rather than
LF, to allow the file to be viewed with Notepad.

premake/Xcode/build-scripts/build.all.xcode4.x86_64.command

@@ -0,0 +1,33 @@
+#!/bin/sh
+
+testsTotal=0
+testsPassed=0
+testsFailed=0
+testsSkipped=0
+
+function build() {
+	testsTotal=$(($testsTotal + 1))
+	if [ -d "tests/$1" ]; then
+		"xcodebuild" ARCHS=x86_64 ONLY_ACTIVE_ARCH=NO -workspace ./SDL.xcworkspace/ -scheme "$1"
+		if [ $? -ne 0 ]; then
+			testsFailed=$(($testsFailed + 1))
+		else
+			testsPassed=$(($testsPassed + 1))
+		fi
+		echo "\033]0;Building: $1\007"
+	else
+		testsSkipped=$(($testsSkipped + 1))
+	fi
+}
+
+# change to directory above command file
+cd `dirname $0`/..
+
+# build all of the tests
+for d in ./tests/*; do
+	build `basename $d`
+done
+
+echo "Build Summary: Total=$testsTotal Passed=$testsPassed Failed=$testsFailed Skipped=$testsSkipped"
+
+cd ..