feat: add Postcode and Outcode Eloquent models

app/Models/Postcode.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Postcode extends Model
+{
+    protected $primaryKey = 'postcode';
+
+    public $incrementing = false;
+
+    public $timestamps = false;
+
+    protected $keyType = 'string';
+
+    protected $fillable = [
+        'postcode',
+        'outcode',
+        'lat',
+        'lng',
+    ];
+
+    protected $casts = [
+        'lat' => 'float',
+        'lng' => 'float',
+    ];
+}