[Readme][xs] - update readme

Author: mariorodeghiero

README.md

@@ -1,5 +1,7 @@
 <div align="center">
 
+<a href="https://www.buymeacoffee.com/vuetheme" target="_blank"><img src="https://cdn.buymeacoffee.com/buttons/v2/default-yellow.png" alt="Buy Me A Coffee" style="height: 60px !important;width: 217px !important;" ></a>
+
 [![Visual Studio Marketplace](https://vsmarketplacebadge.apphb.com/installs-short/mariorodeghiero.vue-theme.svg?style=flat-square)](https://marketplace.visualstudio.com/items?itemName=mariorodeghiero.vue-theme)
 [![Version](https://vsmarketplacebadge.apphb.com/version-short/mariorodeghiero.vue-theme.svg)](https://marketplace.visualstudio.com/items?itemName=mariorodeghiero.vue-theme)
 [![Rating](https://vsmarketplacebadge.apphb.com/rating-short/mariorodeghiero.vue-theme.svg)](https://marketplace.visualstudio.com/items?itemName=mariorodeghiero.vue-theme)