[API] Begin adding mct.js

...which will provide an instance of OpenMCT at startup,
as well as house documentation for entry point to public API.

src/mct.js

@@ -0,0 +1,11 @@
+define(['./OpenMCT'], function (OpenMCT) {
+    /**
+     * This is Open MCT.
+     */
+    var mct = {};
+
+    var app = new OpenMCT();
+
+    return mct;
+});
+