feat: add UserAvatar model and user relationship

app/Models/UserAvatar.php

@@ -0,0 +1,50 @@
+<?php
+
+/**
+ * Created by Reliese Model.
+ */
+
+namespace App\Models;
+
+use Carbon\Carbon;
+use Illuminate\Database\Eloquent\Model;
+
+/**
+ * Class UserAvatar
+ * 
+ * @property int $id
+ * @property int $file_id
+ * @property int $user_id
+ * @property Carbon $created_at
+ * @property Carbon $updated_at
+ * 
+ * @property File $file
+ * @property User $user
+ *
+ * @package App\Models
+ */
+class UserAvatar extends Model
+{
+	protected $table = 'user_avatars';
+	public static $snakeAttributes = false;
+
+	protected $casts = [
+		'file_id' => 'int',
+		'user_id' => 'int'
+	];
+
+	protected $fillable = [
+		'file_id',
+		'user_id'
+	];
+
+	public function file()
+	{
+		return $this->belongsTo(File::class);
+	}
+
+	public function user()
+	{
+		return $this->belongsTo(User::class);
+	}
+}