Added achievement data

app/Models/Alliance.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class Alliance extends Model
+{
+    protected $table = 'alliances';
+
+    protected $fillable = [
+        'internal_name',
+        'name',
+    ];
+
+    protected $casts = [
+        'internal_name' => 'string',
+    ];
+
+    public function airlines(): HasMany
+    {
+        return $this->hasMany(Airline::class);
+    }
+}