add user entity

backend/database/migrations/0001_01_01_000000_create_users_table.php

@@ -0,0 +1,21 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('users', function (Blueprint $table): void {
+            $table->id();
+            $table->string('email')->unique();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('users');
+    }
+};