add windows graph sample

sample/package.json

@@ -3,6 +3,7 @@
   , "version": "0.0.1"
   , "private": true
   , "dependencies": {
+      "@microsoft/microsoft-graph-client": "^1.0.0",
       "adal-node": ">= 0.1.3",
       "express": "3.x",
       "connect-logger": "0.x",

sample/windows-graph-sample.js

@@ -0,0 +1,34 @@
+const AuthenticationContext = require('adal-node').AuthenticationContext;
+const MicrosoftGraph = require("@microsoft/microsoft-graph-client");
+
+const authorityHostUrl = 'https://login.windows.net';
+const tenantName = ''; //azure active directory tenant name. ie: name.onmicrosoft.com
+const authorityUrl = authorityHostUrl + '/' + tenantName;
+const applicationId = ''; //application id for registered app
+const clientSecret = ''; //azure active directory registered app secret
+const resource = "https://graph.microsoft.com"; //URI of resource where token is valid
+
+const context = new AuthenticationContext(authorityUrl);
+
+context.acquireTokenWithClientCredentials(
+    resource,
+    applicationId,
+    clientSecret,
+    function(err, tokenResponse) {
+    if (err) {
+      console.log('well that didn\'t work: ' + err.stack);
+    } else {
+      let client = MicrosoftGraph.Client.init({
+        defaultVersion: 'v1.0',
+        authProvider: (done) => {
+            done(null, tokenResponse.accessToken);
+        },
+      });
+
+      client
+      .api('/users')
+      .get((err, result) => {
+          console.log(result, err);
+      });
+    }
+});