added Model classes

backend/api/src/model/Leaderboard.ts

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+import {LeaderboardEntry} from "./LeaderboardEntry.js";
+
+export class Leaderboard<T> {
+    content: LeaderboardEntry<T>[];
+}

backend/api/src/model/LeaderboardEntry.ts

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+export interface LeaderboardEntry<T> {
+    rank: number,
+    username: string,
+    score: T,
+}

backend/api/src/model/Time.ts

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+export interface Time {
+    seconds: number,
+    minutes?: number,
+    hours?: number,
+    days?: number,
+}

backend/api/src/model/UserData.ts

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+export interface UserData {
+    username: string,
+    highscore: number,
+    totalScore: number,
+    totalPlaytime: string,
+    averageScore: number,
+    gamesPlayed: number,
+}