Update README.md

Author: linghaoSu

README.md

@@ -11,6 +11,9 @@ The regular visualization method comes from this [project](https://gitlab.com/ja
 
 The regularity used to detect regular expressions comes from this [project](https://github.com/chrmarti/vscode-regex/blob/41062efe8aa5113e8902742ae270e090a3de5c5e/src/extension.ts#L14)
 
+Hover over a regular expression to display:
+
+<img width="763" alt="image" src="https://github.com/linghaoSu/vscode-regex-visualizer/assets/56526981/614e9505-a40a-42f9-952c-a1fadd9c8a06">
 
 ## License