Initial files for playlist structuring.

src/player/Playlist.js

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+import PlaylistSong from "./PlaylistSong";
+
+export default function Playlist() {
+    this._list = [];
+
+    this.songAtIndex = function (index) {
+        return this.list[index];
+    };
+
+    this.songsWithName = function (name) {
+        return this._list.filter((item) => item.getDisplayName() == name);
+    };
+
+    this.add = function (url, name, author) {
+        this._list.push(new PlaylistSong(url, name, author, this, this._list.length));
+    };
+
+    this.remove = function (index) {
+        let removed = this._list.splice(index, 1);
+        if (removed.length > 0) {
+            return removed[0];
+        }
+    };
+
+    this.findSongIndex = function (name) {
+        return this._list.findIndex((item) => item.getDisplayName() == name);
+    };
+}

src/player/PlaylistSong.js

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+export default function PlaylistSong(url, name, author, playlist) {
+    this._displayName = name;
+    this._author = author;
+    this._url = url;
+    this._mediaStream = null;
+    this._playlist = playlist;
+
+    this.getAudio = function () {
+        if (this.mediaStream) {
+            return this.mediaStream;
+        }
+        this.mediaStream = new Audio(url);
+    };
+    this.getDisplayName = function () {
+        return this._displayName;
+    };
+    this.getAuthor = function () {
+        return this._getAuthor;
+    };
+    this.getUrl = function () {
+        return this._url;
+    };
+    this.getPlaylist = function () {
+        return this._playlist;
+    };
+}