Implemented macOS Support

Example/Example for lottie-macos/ViewController.m

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+//
+//  ViewController.m
+//  Example for lottie-macos
+//
+//  Created by Oleksii Pavlovskyi on 2/2/17.
+//  Copyright © 2017 Brandon Withrow. All rights reserved.
+//
+
+#import "ViewController.h"
+#import <Lottie/Lottie.h>
+
+@interface ViewController ()
+
+@property (nonatomic, strong) LAAnimationView *lottieLogo;
+
+@end
+
+@implementation ViewController
+
+- (void)viewDidLoad {
+    [super viewDidLoad];
+
+    self.lottieLogo = [LAAnimationView animationNamed:@"LottieLogo1"];
+    self.lottieLogo.contentMode = LAViewContentModeScaleAspectFill;
+    self.lottieLogo.frame = self.view.bounds;
+    self.lottieLogo.autoresizingMask = NSViewWidthSizable | NSViewHeightSizable;
+    
+    [self.view addSubview:self.lottieLogo];
+}
+
+- (void)viewDidAppear {
+    [super viewDidAppear];
+    [self.lottieLogo play];
+}
+
+- (void)viewDidDisappear {
+    [super viewDidDisappear];
+    [self.lottieLogo pause];
+}
+
+@end