Add models

frontend/ng-karaoqueue/src/app/models/artist.model.ts

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+export class Artist {
+  id: number;
+  name: string;
+}

frontend/ng-karaoqueue/src/app/models/genre.model.ts

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+export class Genre {
+  id: number;
+  name: string;
+}

frontend/ng-karaoqueue/src/app/models/language.model.ts

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+export class Language {
+  id: number;
+  name: string;
+}

frontend/ng-karaoqueue/src/app/models/song.model.ts

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+import { Genre } from './genre.model';
+import { Language } from './language.model';
+import { Artist } from './artist.model';
+
+export class Song {
+  explicit: boolean;
+  duet: boolean;
+  title: string;
+  id: number;
+  karafun_id: number;
+  genres: Array<Genre>;
+  languages: Array<Language>;
+  artist: Artist;
+}