Add PBandGraphOauth scaffold and auth UI

node_modules/@microsoft/microsoft-graph-client/lib/src/IAuthProviderCallback.d.ts

@@ -0,0 +1,12 @@
+/**
+ * -------------------------------------------------------------------------------------------
+ * Copyright (c) Microsoft Corporation.  All Rights Reserved.  Licensed under the MIT License.
+ * See License in the project root for license information.
+ * -------------------------------------------------------------------------------------------
+ */
+/**
+ * @interface
+ * Signature that defines callback for an authentication provider
+ * @callback - The anonymous callback function which takes two params
+ */
+export type AuthProviderCallback = (error: any, accessToken: string | null) => void;