Front: Add 'Lesson' Model

front/models/Competency.ts

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+type Competency = 'rhythm'
+	| 'two-hands'
+	| 'combos'
+	| 'arpeggio'
+	| 'distance'
+	| 'left-hand'
+	| 'right-hand'
+	| 'lead-head-change'
+	| 'chord-complexity'
+	| 'chord-timing'
+	| 'pedal'
+	| 'precision'
+
+
+export default Competency;

front/models/Lesson.ts

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+import Competency from "./Competency";
+import Model from "./Model";
+
+/**
+ * A Lesson is an exercice that the user can try to practice a competency
+ */
+interface Lesson extends Model {
+	/**
+	 * The title of the lesson
+	 */
+	title: string,
+	/**
+	 * Short description of the lesson
+	 */
+	description: string;
+	/**
+	 * The minimum level required for the user to access this lesson
+	 */
+	requiredLevel: number;
+	/**
+	 * The main competency learnt in this lesson
+	 */
+	mainCompetency: Competency;
+}
+
+export default Lesson;

front/models/Model.ts

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+interface Model {
+	id: number;
+	slug: string;
+}
+
+export default Model;