Front: Add Models for API Wrapping

front/models/Chapter.ts

@@ -0,0 +1,14 @@
+import Competency from "./Competency";
+import Model from "./Model";
+
+interface Chapter extends Model {
+	start: number;
+	end: number;
+	songId: number;
+	name: string;
+	type: 'chorus' | 'verse';
+	key_aspect: Competency;
+	difficulty: number
+}
+
+export default Chapter;