More descriptive alt values added to all images.

Author: russom

Wireframe/images/wireframeIn.jpg

@@ -17,7 +17,10 @@ <h2>
     </header>
     <main>
       <article>
-        <img src="images/README.png" alt="" />
+        <img
+          src="images/README.png"
+          alt="GitHub README page for the Wireframe project showing learning objectives and project requirements"
+        />
         <h3>The purpose of a README file</h3>
         <p>
           A README file, usually written as README.md, is a document that
@@ -36,7 +39,10 @@ <h3>The purpose of a README file</h3>
         </a>
       </article>
       <article>
-        <img src="images/wireframeInB&W.jpg" alt="Wireframe example" />
+        <img
+          src="images/wireframeInB&W.jpg"
+          alt="Wireframes website mockup showing a browser window layout with a large hero section, image placeholder, navigation elements, and the text 'Wire Frames'"
+        />
         <h3>The purpose of a wireframe</h3>
         <p>
           A wireframe is a simple diagram that shows the basic structure and
@@ -55,7 +61,10 @@ <h3>The purpose of a wireframe</h3>
         </a>
       </article>
       <article>
-        <img src="images/branchGit1.png" alt="" />
+        <img
+          src="images/branchGit1.png"
+          alt="Git Branching graphic featuring the Git logo and the text 'Git Branching' on a dark background"
+        />
         <h3>The Purpose of Branch in Git</h3>
         <p>
           A branch is a sequence of commits that allows developers to work on