add coppwr ebuild, that actually works!

games-board/arena-bin/Manifest

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+DIST arenalinux_64bit_3.10beta.tar.gz 40829864 BLAKE2B d8b0b30d9a99ef61ee5e60b42f2cd6b1f441285ea0bce1e5f1f93d0996e2583f5ada6825fe0242e9a3334831f87ff4bcf9cef065d1c99d30eb9a2aff2ab99ddd SHA512 36f0c2fe364c91fbce26d05db33dc46fd83e5df17728db4e50e19e24b26527da22d691585f607fd300f4dab76c66f96209faf62f698925ff31fe8c2d011bf6bd

games-board/arena-bin/arena-bin-3.10.ebuild

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+EAPI=8
+
+inherit desktop xdg
+
+DESCRIPTION="Playwitharena chess gui"
+HOMEPAGE="https://www.playwitharena.de/"
+SRC_URI="http://www.playwitharena.de/downloads/arenalinux_64bit_3.10beta.tar.gz"
+
+LICENSE="GPL-2+ LGPL-2.1+"
+KEYWORDS="amd"
+SLOT="0"
+
+S=${WORKDIR}
+
+pkg_preinst() {
+	doicon "${S}/Arena.ico"
+	domenu "${S}/Integration/Desktop/userapp-Arena_linux.desktop.template"
+
+}