Fix for issue #3: Implement Telemetry public API surface

Author: shivbijlani

lib/Telemetry.ts

@@ -0,0 +1,17 @@
+namespace MSAL {
+    class Telmetry {
+        private static instance: Telmetry;
+        private receiverCallback: (r: Array<Object>) => void;
+
+        private constructor() {
+        }
+
+        RegisterReceiver(receiverCallback: (receiver: Array<Object>) => void): void {
+            this.receiverCallback = receiverCallback;
+        }
+
+        static GetInstance(): Telmetry {
+            return this.instance || (this.instance = new this());
+        }
+    }
+}