add donation links

Author: vikrantnegi

README.md

@@ -218,3 +218,10 @@ Strip out empty p and span tags
 
 Licensed under the [MIT](https://github.com/vikrantnegi/shopify-code-snippets/blob/master/LICENSE).
 
+## Donation
+
+If this project helped you reduce time to develop, please consider buying me a cup of coffee :)
+
+<a href="https://www.buymeacoffee.com/vikrantnegi" target="_blank"><img src="https://www.buymeacoffee.com/assets/img/custom_images/orange_img.png" alt="Buy Me A Coffee" style="height: 41px !important;width: 174px !important;box-shadow: 0px 3px 2px 0px rgba(190, 190, 190, 0.5) !important;-webkit-box-shadow: 0px 3px 2px 0px rgba(190, 190, 190, 0.5) !important;" ></a>
+
+[![ko-fi](https://www.ko-fi.com/img/githubbutton_sm.svg)](https://ko-fi.com/E1E6Z0JL)