Mention fork origin

Author: FichteFoll

README.md

@@ -5,6 +5,9 @@ Sublime Text Syntax highlighting for single-file [Vue.js](http://vuejs.org) comp
 The `main` branch targets Sublime Text 4.
 For the Sublime Text 2 and 3 support (`.tmlanguage` files), see `st2` branch.
 
+This repository is a fork of [vuejs/vue-syntax-highlight](https://github.com/vuejs/vue-syntax-highlight)
+with a focus on providing syntax highlighting only for Sublime Text.
+
 <p align="center">
   <img width="809px" src="https://raw.githubusercontent.com/vuejs/vue-syntax-highlight/new/samples/screenshot.png">
 </p>