added alt attributes to images

Author: burhan-mustafa

Wireframe/index.html

@@ -15,7 +15,7 @@ <h1>Web Development</h1>
     </header>
     <main>
       <article>
-        <img src="./images/branch.png" alt="">
+        <img src="./images/branch.png" alt="A computer screen showing a visual Git branch diagram">
         <h2>Git Branches </h2>
         <p>
           In this article we will cover the purpose of a branch in git
@@ -24,14 +24,14 @@ <h2>Git Branches </h2>
         </article>
 
       <article>
-        <img src="./images/wireframes.png" alt="">
+        <img src="./images/wireframes.png" alt="A paper website wireframe design on a desk">
         <h2>Wireframes</h2>
         <p>This article will cover the importance of a Wireframe</p>
         <a rel="html" href="wireframe.html">Read more</a>
       </article> 
 
       <article>
-        <img src ="./images/readme.png" alt="">
+        <img src ="./images/readme.png" alt="README file displayed on a laptop screen">
        <h2>README files</h2>
        <p>We shall look at the purpose of a README file</p>
        <a rel="html" href="README.html">Read more</a>