Add installation instructions to readme

README.md

@@ -3,3 +3,13 @@
 Minimal theme for the rEFInd boot manager
 
 ![Screenshot](http://i.imgur.com/e7Zg8xI.png?1)
+
+## Installation
+
+1. Locate your rEFInd installation folder
+
+2. Create a folder called `themes` inside it, if it doesn't already exist
+
+3. Clone this repo into the `themes` folder
+
+4. Add `include themes/ambience/theme.conf` to `refind.conf`