restore composer.json, add mysqli extension

app/Models/Currency.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Currency extends Model
+{
+    protected $fillable = [
+        'dollar',
+        'euro',
+        'sum'
+    ];
+
+    protected $casts = [
+        'dollar' => 'integer',
+        'euro' => 'integer',
+    ];
+
+    public static function getCurrency()
+    {
+        return self::latest()->first();
+    }
+}