Add appdata support for xfce4-termianl

Submitted by Mukundan Ragavan

Assigned to Nick Schermer

Link to original bug (#11374)

Description

Created attachment 5818 appdata file

Please add appdata support for xfce4-terminal.

$ appstream-util validate xfce4-terminal.appdata.xml xfce4-terminal.appdata.xml: OK

screenshots are here - https://nonamedotc.fedorapeople.org/appdata/screenshots (already referenced in the appdata file)

Attachment 5818, "appdata file":
xfce4-terminal.appdata.xml