Updated readme

Signed-off-by: Marcus Noble <github@marcusnoble.co.uk>

README.md

@@ -2,12 +2,32 @@
 
 Checks the users Storygraph "to read" list and shows the highest rated in various catergories.
 
+![](./screenshot.png)
+
+Note: This is likely to break as currently there is no Storygraph API and this relies on HTML parsing.
+
 ## Features
 
-## Install
+* Uses the users cookie to authenticate
+* Shows the top rated book from the users "To read" list grouped into the following categories:
+  * Fiction
+  * Non-Fiction
+  * Comics
+  * Art
+  * Business
+  * Fantasy
+  * Health
+  * Sci-Fi
+  * Technology
+* The next 5 highest rated in each category can be displayed in a modal popup
+* The listings are refreshed hourly
+
+## Running
+
+You must first get the cookie for your Storygraph user account and setting it as the `COOKIE` environment variable.
 
 ```sh
-
+go run .
 ```
 
 ## Building from source
@@ -24,8 +44,6 @@ Standalone:
 make build
 ```
 
-## Resources
-
 ## Contributing
 
 If you find a bug or have an idea for a new feature please [raise an issue](issues/new) to discuss it.