add image, image title, article title

Author: Dipa-Sarker

Wireframe/index.html

@@ -55,6 +55,14 @@ <h3>Summary</h3>
         </p>
         <a href="https://en.wikipedia.org/wiki/Website_wireframe">Read more</a>
       </article>
+      <article>
+        <img src="https://docs.github.com/assets/cb-2058/images/help/branches/pr-retargeting-diagram1.png" alt="Git Branch" />
+        <h2>What is a branch in Git?</h2>
+        <h3>Summary</h3>  
+        <p>
+          
+        </p>
+      </article>
     </main>
     <footer>
       <p>