add How-to & Signout modal

src/browser/main/tpls/modals/sign-out-modal.html

@@ -0,0 +1,16 @@
+<div class="new-snippet-modal">
+  <div class="modal-header">
+    <h4>Sign Out</h4>
+  </div>
+
+  <div class="modal-body">
+    <p>
+      Are you sure to sign out?
+    </p>
+  </div>
+
+  <div class="modal-footer">
+    <button ng-click="vm.submit()" type="button" name="button" class="btn btn-danger">Sign Out</button>
+    <button ng-click="vm.cancel()" type="button" name="button" class="btn btn-default">Cancel</button>
+  </div>
+</div>

src/browser/main/tpls/states/auth.signin.tpl.html

@@ -1,4 +1,7 @@
 <form ng-submit="vm.signIn()">
+  <p ng-if="vm.authFailed" class="alert alert-danger">
+    Incorrect email or password entered. Please try again.
+  </p>
   <div class="form-group">
     <label for="email">E-mail</label>
     <input ng-model="vm.email" type="text" id="email" name="name" class="form-control" placeholder="E-mail">

src/browser/main/tpls/states/home.tpl.html

@@ -1,9 +1,47 @@
 <div class="home-state">
-  <h1 class="jumbotron">Codexen App <small>v0.2</small></h1>
+  <h1 class="jumbotron">Codexen App <small>v0.1.1</small></h1>
+
+  <h2>About CodeXen</h2>
+
   <p>
-    App for Code snippets<br>
+    CodeXen is short code storage tool make coding more stressless. If you use CodeXen, then you will be disentangled from troublesome organizing a large number of snippets and googling same code many times.
   </p>
 
+  <ol>
+    <li>
+      <h4>
+        Post your code
+      </h4>
+      <p>
+        Post your commonly used code with description,category,and tags.
+      </p>
+    </li>
+    <li>
+      <h4>
+        Save on cloud
+      </h4>
+      <p>
+        From short snippet to long complex code,CodeXen saves any code simply.
+      </p>
+    </li>
+    <li>
+      <h4>
+        Use code like a magic
+      </h4>
+      <p>
+        CodeXen call code you posted whereever you are.Type [shift+control+tab] simultaneously.
+      </p>
+    </li>
+    <li>
+      <h4>
+        Code Elegantly
+      </h4>
+      <p>
+        That's all!
+        You must be loved with CodeXen. Enjoy coding;)
+      </p>
+    </li>
+  </ol>
   <p>
     © 2015 MAISIN&CO.,Inc.
   </p>