This is a custom theme for Ghost (https://en.ghost.org).
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Copy the contents of the .zip file into /content/themes/.
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You need to restart your Ghost instance. After that you can switch themes inside your Ghost admin (http://your.domain.com/ghost/settings/general/). Scroll down and choose "Readium".
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Now you can customize your logo, langing page image, as well as user images and texts to fit the theme.
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Have fun.