Adding OM alias

Author: rube200

src/Commands/CommandOpenMod.cs

@@ -201,7 +201,11 @@ private CommandStep GetNextStep()
         public string Name { get; } = "openmod";
         public string Help { get; } = "Installs OpenMod";
         public string Syntax { get; } = "install";
-        public List<string> Aliases { get; } = new List<string>();
+
+        public List<string> Aliases { get; } = new()
+        {
+            "om"
+        };
         public List<string> Permissions { get; } = new List<string>();
     }
 }