Add image for merging PR

Co-authored-by: Courtney Wilson <77312589+cmwilson21@users.noreply.github.com>

Author: ethanpalm

content/get-started/quickstart/hello-world.md

@@ -132,6 +132,7 @@ Sometimes, a pull request may introduce changes to code that conflict with the e
 In this walk-through, you should not have any conflicts, so you are ready to merge your branch into the main branch.
 
 1. Click **Merge pull request** to merge the changes into `main`.
+  ![Screen shot of merge button.](/assets/images/help/pull_requests/pullrequest-mergebutton.png)
 2. Click **Confirm merge**. You will receive a message that the request was successfully merged and the request was closed.
 3. Click **Delete branch**. Now that your pull request is merged and your changes are on `main`, you can safely delete the `readme-edits` branch. If you want to make more changes to your project, you can always create a new branch and repeat this process.