add release build readme

Author: TravisEz13

tools/releaseBuild/README.md

@@ -0,0 +1,14 @@
+# VSTS Release Builds
+
+## Requirements
+
+Docker must be installed to run any of the release builds.
+
+## Running Windows Release Builds
+
+From PowerShell on Windows, run `.\vstsbuild.ps1 -Name <buildName>`.
+
+Windows Build Names:
+
+ * `win`
+     * Builds on windows