Update README.md

Author: ecmel

README.md

@@ -173,3 +173,7 @@ Clears file cache.
 ## Installation
 
 Extension can be installed from [Visual Studio Code Marketplace](https://marketplace.visualstudio.com/items?itemName=ecmel.vscode-html-css).
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+## Buy me a coffe
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+https://www.buymeacoffee.com/ecmel