chore: add custom titles, description and chapters

ios/Video/DataStructures/Chapter.swift

@@ -0,0 +1,25 @@
+
+struct Chapter {
+    let title: String
+    let uri: String
+    let startTime: Double
+    let endTime: Double
+    
+    let json: NSDictionary?
+    
+    init(_ json: NSDictionary!) {
+        guard json != nil else {
+            self.json = nil
+            self.title = ""
+            self.uri = ""
+            self.startTime = 0
+            self.endTime = 0
+            return
+        }
+        self.json = json
+        self.title = json["title"] as? String ?? ""
+        self.uri = json["uri"] as? String ?? ""
+        self.startTime = json["startTime"] as? Double ?? 0
+        self.endTime = json["endTime"] as? Double ?? 0
+    }
+}

ios/Video/DataStructures/VideoSource.swift

@@ -8,6 +8,10 @@ struct VideoSource {
     let requestHeaders: Dictionary<String,Any>?
     let startTime: Int64?
     let endTime: Int64?
+    // Custom Metadata
+    let title: String?
+    let subtitle: String?
+    let description: String?
     
     let json: NSDictionary?
     
@@ -22,6 +26,9 @@ struct VideoSource {
             self.requestHeaders = nil
             self.startTime = nil
             self.endTime = nil
+            self.title = nil
+            self.subtitle = nil
+            self.description = nil
             return
         }
         self.json = json
@@ -33,5 +40,8 @@ struct VideoSource {
         self.requestHeaders = json["requestHeaders"] as? Dictionary<String,Any>
         self.startTime = json["startTime"] as? Int64
         self.endTime = json["endTime"] as? Int64
+        self.title = json["title"] as? String
+        self.subtitle = json["subtitle"] as? String
+        self.description = json["description"] as? String
     }
 }