first upload all files

Modules/Currency/Database/Migrations/2018_05_17_115822452977_create_currency_rates_table.php

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+<?php
+
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+
+class CreateCurrencyRatesTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('currency_rates', function (Blueprint $table) {
+            $table->increments('id');
+            $table->string('currency')->unique();
+            $table->decimal('rate', 8, 4)->nullable();
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('currency_rates');
+    }
+}