theme fix

THEMES.md

@@ -12,11 +12,18 @@ Version 1.7 brings basic support for themes.
   ```
 * All resources (including icons which can not be renamed for now) will be looked up in `<home dir>/.katrain` first, so files with identical names there can be used to override sounds and images.
 
-## Available themes
+## Installation
 
-* See [here](https://github.com/sanderland/katrain/blob/master/themes/) for available themes. 
 * To install a theme, simply unzip the theme.zip to your .katrain folder. 
   * On windows you can find it in C:\Users\you\.katrain and on linux in ~/.katrain.
   * When in doubt, the general settings dialog will also show the location.
 * To uninstall a theme, remove theme.json and all relevant images from that folder.
 
+## Available themes
+
+### Alternate board/stones theme by "koast"
+
+[Download](https://github.com/sanderland/katrain/blob/master/themes/koast-theme.zip)
+
+![Preview](https://raw.githubusercontent.com/sanderland/katrain/master/themes/koast.png)
+