Update themes.md

Author: imp

content/docs/themes.md

@@ -3,4 +3,4 @@ title: Themes
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-Coming soon
+Themes are the way to customize your background and text. You get the default. There are 20 extra themes. You can make your own theme by either by change a existing theme or make a new XML docement, whichever suits you best. Just like UGL, you can share and edit freely.