added the initial header controller

js/controllers/header.js

@@ -0,0 +1,15 @@
+'use strict';
+
+angular.module('cosign.header').controller('HeaderController',
+  function($scope, $rootScope, $location) {
+
+    $scope.init = function() {
+      $rootScope.isLogged = false;
+    };
+
+    $scope.signout = function() {
+      $rootScope.isLogged = false;
+
+      $location.path('signin');
+    };
+  });