chore(core): added JSDoc comments (useless in ts)

src/core/VideoPlayer.ts

@@ -76,29 +76,51 @@ https://git.db123.ir/db/VideoPlayer
     this.adapter.pause();
   }
 
+  /**
+   * @returns {number} Gets the current time
+   */
   get time(): number {
     return this.adapter.time;
   }
 
+  /**
+   * @param {number} time Sets the current time
+   */
   set time(time: number) {
     this.adapter.time = time;
   }
 
+  /**
+   * @returns {number} Gets the volume
+   */
   get volume(): number {
     return this.adapter.volume;
   }
 
+  /**
+   * @param {number} volume Sets the volume
+   */
   set volume(volume: number) {
     this.adapter.volume = volume;
   }
 
+  /**
+   * @returns {boolean} Gets current mute state
+   */
   get muted(): boolean {
     return this.adapter.muted;
   }
+
+  /**
+   * @param {boolean} muted Sets mute state
+   */
   set muted(muted: boolean) {
     this.adapter.muted = muted;
   }
 
+  /**
+   * @returns {number} The duration of video
+   */
   duration(): number {
     return this.adapter.duration();
   }