Add rare/legendary installers

overlay/usr/share/applications/install.legendary.desktop

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+[Desktop Entry]
+Name=Installer - Rare/Legendary (Epic Games Commandline Launcher)
+Categories=Game;
+Exec=/opt/scripts/install_legendary.sh %U
+Icon=installsoftware
+Terminal=true
+Type=Application

overlay/usr/share/applications/rare.desktop

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+[Desktop Entry]
+Name=Rare - (Epic Games Store)
+Comment=A frontend for legendary, the open source Epic Games Store alternative
+GenericName=Rare - (Epic Games Store)
+X-GNOME-FullName=Rare - (Epic Games Store)
+Exec=/usr/local/bin/rare %u
+Terminal=false
+X-MultipleArgs=false
+Type=Application
+Icon=rare
+Categories=Game;