Add installation notes

README.md

@@ -19,3 +19,22 @@ Username and password for the backend are both `admin`.
 
 Not yet... Check out the demo, browse the source, and have a gander at the optional
 [theme](https://github.com/dshoreman/octoshop-theme) if you want to play about.
+
+
+## Installation
+
+Installing Octoshop is fairly simple, despite not yet being available in the October CMS Plugin store.
+All you need to do is clone this repository, fire off composer and run the migrations:
+
+```
+cd /path/to/october-cms
+mkdir -p plugins/dshoreman
+git clone https://github.com/dshoreman/oc-shop.git plugins/dshoreman/shop
+cd plugins/dshoreman/shop; composer install; cd -
+php artisan october:up
+```
+
+Once you've completed the terminal bits, all that's left is to setup your Stripe API keys
+in the backend. You'll find them in the Shop section of the Settings page.
+
+If you'd like to get started by trying the theme too, clone it into themes/octoshop.