支持更多音视频格式，添加点播测试页面

Example/SellyCloudSDK/Play/AVVodItemModel.h

@@ -0,0 +1,24 @@
+//
+//  AVVodItemModel.h
+//  SellyCloudSDK_Example
+//
+
+#import <Foundation/Foundation.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface AVVodItemModel : NSObject
+
+@property (nonatomic, copy) NSString *url;
+@property (nonatomic, copy) NSString *cover;
+@property (nonatomic, copy) NSString *title;
+@property (nonatomic, copy) NSString *type;  // mp4, hls, flv, etc.
+
++ (instancetype)modelWithUrl:(NSString *)url
+                       cover:(NSString *)cover
+                       title:(NSString *)title
+                        type:(NSString *)type;
+
+@end
+
+NS_ASSUME_NONNULL_END