add welcome page

public/css/style.css

@@ -33,7 +33,7 @@ html,body{height:100%;overflow: hidden;background: -webkit-linear-gradient(300de
     margin-bottom:10px;
     text-shadow: 1px 1px 1px rgba(0,0,0,.3);
     font-weight: 100;
-    font-size: 42px;
+    font-size: 72px;
 }
 .section-center .container .cover-description{    
     margin-bottom: 30px;

views/welcome.pug

@@ -4,7 +4,7 @@ block content
 	div.section-center
 		div.container
 			div.cover-heading JsonBird
-			div.cover-description 业界领先的 JSON 代理服务
+			div.cover-description 业界领先的远程 JSON 代理服务
 			div.cover-action
 				a.btn.btn-ghost-light(href="/v1/?url=http://www.bing.com/HPImageArchive.aspx?format=js&idx=16&n=1") Quick Start