add meta description tag

Author: tomdu3

Wireframe/index.html

@@ -5,6 +5,8 @@
   <meta charset="UTF-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>Wireframe</title>
+  <meta name="description"
+    content="A quickstart guide to building, documenting, and maintaining web projects with GitHub. Learn about README files, wireframes, and Git branching." />
   <link rel="stylesheet" href="style.css" />
 </head>