Added install instructions to README

Author: shnhrrsn

README.markdown

@@ -1,5 +1,14 @@
-## Grind Stone Syntax Highlighter for Sublime
+## Grind Stone for Sublime
 This package adds syntax definitions to Sublime for the [Grind](https://grind.rocks) Stone engine.
 
+## Installation
+The quickest way to install the Grind Stone package is by adding this repository to [Package Control](https://packagecontrol.io/installation).
+
+1. Open Package Control via `<cmd>`+`<shift>`+`<p>`
+2. Go to `Package Control: Add Repository`
+3. Enter https://github.com/grindjs/stone-editor-sublime
+4. Go to `Package Control: Install Package`
+5. Then enter `stone-editor-sublime`
+
 ## Credits
 This package has been adapted from [Medalink/laravel-blade](https://github.com/Medalink/laravel-blade) and [dev4dev/blade-snippets](https://github.com/dev4dev/blade-snippets).