Add Mac platform

Source/Engine/Main/Mac/main.cpp

@@ -0,0 +1,24 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+#if PLATFORM_MAC
+
+#include "Engine/Engine/Engine.h"
+#include "Engine/Core/Types/StringBuilder.h"
+
+int main(int argc, char* argv[])
+{
+    // Join the arguments
+    StringBuilder args;
+    for (int i = 1; i < argc; i++)
+    {
+        args.Append(argv[i]);
+
+        if (i + 1 != argc)
+            args.Append(TEXT(' '));
+    }
+    args.Append(TEXT('\0'));
+
+    return Engine::Main(*args);
+}
+
+#endif

Source/Engine/Main/Main.Build.cs

@@ -72,6 +72,9 @@ public class Main : EngineModule
         case TargetPlatform.Switch:
             options.SourcePaths.Add(Path.Combine(Globals.EngineRoot, "Source", "Platforms", "Switch", "Engine", "Main"));
             break;
+        case TargetPlatform.Mac:
+            options.SourcePaths.Add(Path.Combine(FolderPath, "Mac"));
+            break;
         default: throw new InvalidPlatformException(options.Platform.Target);
         }
     }