Add ZNC image, copied from znc.in

znc/content.md

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 ZNC is an IRC network bouncer (BNC). It can detach the client from the actual IRC server, and also from selected channels. Multiple clients from different locations can connect to a single ZNC account simultaneously and therefore appear under the same nickname on IRC.
 
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 [ZNC Wiki](http://znc.in/)
 
 # How to use this image