Wireframes added

The wireframes are based on the Elog.io version of the catalog. They
provide a rough outline of how Elog.io could work. The wireframes were
created using Pencil - a crossplatform free software mockup tool -
http://pencil.evolus.vn/

Note: the wireframes mock up functionality and do not say anything about
the aesthetics nor the visual identity of Elog.io