add appdata file for knights

Review Request #129787 - Created Jan. 7, 2017 and submitted

Information
Burkhard Lück
knights
Reviewers
Kdegames
mihac

info from https://noughmad.wordpress.com/knights/

build + install

Albert Astals Cid
Burkhard Lück
Review request changed

Status: Closed (submitted)

Change Summary:

Submitted with commit ae197e3d9389a35defd69328880b7561b1686bce by Burkhard Lück to branch master.
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