Update README.md

Author: Harshit2012

README.md

@@ -19,5 +19,8 @@ Turns Data into Graph.
 - Click on the graph which you like
 - To download click on download button
 
+## Preview
+![PlotGraph-Graph](https://github.com/Harshit2012/PlotForge/assets/105143145/84bb3e11-ada4-4412-905a-c04a82b3ffd8)
+
 ## License
 This repository is under [MIT License](https://github.com/Harshit2012/PlotForge?tab=MIT-1-ov-file#readme).