add: Add screenshots

README.md

@@ -5,6 +5,16 @@ An Action to check if the PR task list is complete.
 This Action gives you more control over your pull request task list.  
 Also, when a check is missing, this not only causes the Action to fail, but also points it out in the comments.
 
+<details>
+<summary>Screenshots</summary>
+<img src="https://github.com/Awayume/github-pr-tasklist-checker/assets/79361022/e4ab44a2-3a8f-4612-b6b5-f55f7cd7ba5a">
+<img src="https://github.com/Awayume/github-pr-tasklist-checker/assets/79361022/469ed1df-84f1-47d3-abbc-a28ffbb29220">
+<img src="https://github.com/Awayume/github-pr-tasklist-checker/assets/79361022/55710b34-6d4b-4b74-b8b5-e771db102451">
+<img src="https://github.com/Awayume/github-pr-tasklist-checker/assets/79361022/834e89ad-a7f7-4f3d-a42f-2ccf7888d1f3">
+<img src="https://github.com/Awayume/github-pr-tasklist-checker/assets/79361022/87c5d4a2-62ee-4407-bb33-a50a6b2b5438">
+<img src="https://github.com/Awayume/github-pr-tasklist-checker/assets/79361022/c77715f1-eed8-484a-a858-ce69670903eb">
+</details>
+
 ## How to use
 I recommend creating a Pull Request template.  
 In it, write the tasks you want contributors to check.