Angularjs Login Application with Cookies - angularjs

Question

I try to create a login app using Angularjs that storing information in $cookies. Once the user is logged in, they don't have to log in again:
This is login form:
<form action="/" id="login">
<div class="form-group">
<label for="username">Username</label>
<input type="text" name="username" id="username" class="form-control" ng-model="username" required />
</div>
<div class="form-group">
<label for="password">Password</label>
<input type="password" name="password" id="password" class="form-control" ng-model="password" required />
</div>
<div class="form-actions">
<button id="submit_btn" type="button" ng-click="submit()" class="btn btn-danger">Login</button>
</div>
</form>
This is the app.js
var app = angular.module('mailApp', ['angular.chosen','ngRoute','ngCookies'], function(){});
app.config(['$routeProvider', '$locationProvider', function($routeProvider, $locationProvider) {
$routeProvider.
when('/', {
templateUrl: 'login.html',
}).
when('/logs/', {
templateUrl: 'index.html',
controller: 'mailController',
}).
otherwise({
redirectTo: '/'
});
}]);
app.controller('mailController', function($scope, $http,$routeParams,$location,domainService, $rootScope, $location, $cookies)
{
$rootScope = false;
$scope.submit = function (info) {
if($scope.username == '123' && $scope.password == '123') {
$rootScope.loggedIn = true;
$location.path('/logs/');
}
else{
alert('Wrong authentication!');
}
}
//...
}
But I am new to angularjs and not really got to $cookies.
Any help would be appreciated!
Thanks, guys!