Provide some further informations at the README

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 # frio-hovercard
 friendica hovercard addon for the frio theme
+
+This addon provides a hovercard for firendicas frio theme.
+**It not intended to use the plugin without the frio theme or vice versa.
+
+It's a sample implementation how friendica could provide json userdata for
+the hovercard. Ideally we should implement something like a profile data api endpoint like 
+it is done in diaspora & gnu social. This would search at the foreign server for the requested data.
+We could also think about supporting requesting the api of diaspora  and gnu social.
+
+At the present state the data comes from the own contact and gcontact table