Create README.md

Author: banchichen

README.md

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+# TZImagePreviewController
+
+Enhance the TZImagePickerController library, supports to preview photos with UIImage or NSURL.     
+对[TZImagePickerController](https://github.com/banchichen/TZImagePickerController)库的增强，支持用UIImage、NSURL预览照片。     
+
+## 一. Installation 安装
+
+#### CocoaPods
+> pod 'TZImagePreviewController'
+
+#### Carthage
+> github "banchichen/TZImagePreviewController"
+
+#### 手动安装
+> 将TZImagePickerController文件夹拽入项目中，导入头文件：#import "TZImagePreviewController.h"
+
+## 二. Example 例子
+
+```objectivec
+TZImagePreviewController *previewVc = [[TZImagePreviewController alloc] initWithPhotos:self.selectedPhotos currentIndex:indexPath.row tzImagePickerVc:[self createTZImagePickerController]];
+[previewVc setBackButtonClickBlock:^(BOOL isSelectOriginalPhoto) {
+    NSLog(@"back isSelectOriginalPhoto:%d", isSelectOriginalPhoto);
+}];
+[previewVc setSetImageWithURLBlock:^(NSURL *URL, UIImageView *imageView) {
+    [imageView sd_setImageWithURL:URL];
+}];
+[previewVc setDoneButtonClickBlock:^(NSArray *photos, BOOL isSelectOriginalPhoto) {
+    self.selectedPhotos = [NSMutableArray arrayWithArray:photos];
+    NSLog(@"done isSelectOriginalPhoto:%d photos.count:%zd", isSelectOriginalPhoto, photos.count);
+    [self.collectionView reloadData];
+}];
+[self presentViewController:previewVc animated:YES completion:nil];
+```
+  
+## 三. Requirements 要求
+   iOS 8 or later. Requires ARC  
+   iOS8及以上系统可使用. ARC环境.
+
+## 四. More 更多 
+   There is Demo inside, Please refer to Demo for usage.
+   内有Demo，请参考Demo进行使用。