Create README.md

Author: vanillajonathan

README.md

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+# PRQL syntax highlighting for Sublime Text
+
+This package adds syntax highlighting for [PRQL](https://prql-lang.org/) to Sublime Text.
+
+# Installation
+
+The easiest way to install is using Sublime's [Package Control](https://packagecontrol.io/packages/prql).
+It's listed as `PRQL`.
+
+1. Open `Command Palette` using menu item `Tools → Command Palette...`
+2. Choose `Package Control: Install Package`
+3. Find `PRQL` and hit `Enter`