Added signin button.

.gitignore

@@ -1,3 +1,5 @@
 /_devel_/
+/auth.json
+/client_secret.json
 /composer.phar
 /vendor/

.htaccess

@@ -0,0 +1,3 @@
+<Files ~ "\.json$">
+    Require all denied
+</Files>

css/frs.css

@@ -59,3 +59,8 @@
 .mdl-mini-footer--link-list li:hover {
   color: white;
 }
+
+#signin-button:hover {
+  display: block;
+  background: url(../img/btn_google_signin_dark_focus_web.png);
+}

index.php

@@ -9,5 +9,14 @@ $m = new Mustache_Engine(array(
     'logger' => new Mustache_Logger_StreamLogger('php://stderr'),
 ));
 
+$data = array();
+
+$client = new Google_Client();
+$client->setAuthConfigFile('client_secret.json');
+$client->setRedirectUri('https://raspi.mbirth.de/dev/FRS/');
+$client->addScope(Google_Service_Oauth2::USERINFO_EMAIL);
+
+$data['auth_url'] = $client->createAuthUrl();
+
 $tpl = $m->loadTemplate('index_html');
-echo $tpl->render();
+echo $tpl->render($data);

templates/index_html.mustache

@@ -8,6 +8,10 @@
 
 <h3>What is this?</h3>
 
+<p>
+<a href="{{auth_url}}"><img id="signin-button" src="img/btn_google_signin_dark_normal_web.png"/></a>
+</p>
+
 <p>
             Hello, world!
 </p>