add Dark Earth (PC CD) (#126)

Co-authored-by: matthymd <matthias_dillen@telenet.be>

Author: mdmatthias

umu-database.csv

@@ -1188,3 +1188,4 @@ Heroes of Newerth: Reborn,none,none,umu-heroesofnewerthreborn,,Standalone instal
 Fallen Enchantress: Legendary Heroes,gog,1445591825,umu-1445591825,,,FE Legendary Heroes/LegendaryHeroes.exe
 Ghostwire Tokyo,egs,a93cd6111251461c953776a0c4ea4d80,umu-1475810,,,
 Duet Night Abyss,none,none,umu-3950020,,Standalone Installer,Duet Night Abyss/EMLauncher.exe
+Dark Earth,none,none,umu-darkearth,,Dark Earth (PC CD),