create user repo interface

src/Repositories/UserRepository.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Yisroel\DigiWill\Repositories;
+
+use Yisroel\DigiWill\Domain\User;
+
+interface UserRepository
+{
+    public function find(int $id): ?User;
+
+    public function findByEmail(string $email): ?User;
+
+    public function save(User $user): User;
+}