fix lint errors

Summary:
Changelog: [Internal][Yoga] Fixed lint errors

```arc lint --apply-patches --take CLANGFORMAT --paths-cmd 'hg files xplat/yoga'
```
Added .clang-tidy file

Reviewed By: zertosh

Differential Revision: D19948702

fbshipit-source-id: f77a16d6f2c532267597a84a9caded0aae68c3aa

YogaKit/Source/YGLayout+Private.h

@@ -5,13 +5,13 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-#import "YGLayout.h"
 #import <yoga/Yoga.h>
+#import "YGLayout.h"
 
 @interface YGLayout ()
 
-@property (nonatomic, assign, readonly) YGNodeRef node;
+@property(nonatomic, assign, readonly) YGNodeRef node;
 
-- (instancetype)initWithView:(UIView *)view;
+- (instancetype)initWithView:(UIView*)view;
 
 @end