Add stubbed cast.framework API implementation

ext/src/shim/framework/classes/ApplicationMetadata.ts

@@ -0,0 +1,22 @@
+"use strict";
+
+import Image from "../../cast/classes/Image";
+import Session from "../../cast/classes/Session";
+
+
+export default class ApplicationMetadata {
+    public applicationId: string;
+    public images: Image[];
+    public name: string;
+    public namespaces: string[];
+
+    constructor (sessionObj: Session) {
+        this.applicationId = sessionObj.appId;
+        this.images = sessionObj.appImages;
+        this.name = sessionObj.displayName;
+
+        // Convert [{ name: <ns> }, ...] to [ <ns>, ... ]
+        this.namespaces = sessionObj.namespaces.map(
+                namespaceObj => namespaceObj.name);
+    }
+}