Update README.md

Author: tarunk04

README.md

@@ -30,6 +30,9 @@ I have explained the project in my **blog post** check it out here: [Sudoku- Bac
  # Backtracking in Action
  ![visualizer](screenshots/visualizer.gif)
  
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+[![BuyMeCoffe](https://cdn-images-1.medium.com/max/800/1*Dpw8-hNGI2fDmosV4E8DVQ.png)](https://www.buymeacoffee.com/tarunkumar)
+ 
  # Author
  Tarun Kumar