add header description

Author: gideondefar

Wireframe/index.html

@@ -10,7 +10,7 @@
     <header> 
       <h1>Wireframe</h1>
       <p>
-        This is the default, provided code and no changes have been made yet.
+        A wireframe is a simple visual guide that shows the layout and structure of a webpage or app.
       </p>
     </header>
     <main>