feat: Initial commit for Saqel Platform architecture, backend, Docker, and documentation

backend/app/Models/QuizAttempt.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class QuizAttempt extends Model
+{
+    protected $fillable = ['user_id', 'quiz_id', 'score'];
+
+    public function quiz(): BelongsTo
+    {
+        return $this->belongsTo(Quiz::class);
+    }
+
+    public function answers(): HasMany
+    {
+        return $this->hasMany(Answer::class);
+    }
+}