/usr/share/themes/OkayishChicken/README is in gtk2-engines-magicchicken 1.1.1-9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | A port of TigerT's PrettyOkayish theme for ThinIce/GTK+ 2.0 to MagicChicken
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