[YogaKit] support macOS.

YogaKit/YogaKitSample/YogaKitOSXSample/main.m

@@ -0,0 +1,16 @@
+//
+//  main.m
+//  YogaKitOSXSample
+//
+//  Created by lvv on 2020/8/13.
+//  Copyright © 2020 facebook. All rights reserved.
+//
+
+#import <Cocoa/Cocoa.h>
+
+int main(int argc, const char * argv[]) {
+    @autoreleasepool {
+        // Setup code that might create autoreleased objects goes here.
+    }
+    return NSApplicationMain(argc, argv);
+}