Initialize Spring Boot backend with JWT auth

src/main/java/com/openisle/repository/UserRepository.java

@@ -0,0 +1,10 @@
+package com.openisle.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import com.openisle.model.User;
+import java.util.Optional;
+
+public interface UserRepository extends JpaRepository<User, Long> {
+    Optional<User> findByUsername(String username);
+    Optional<User> findByEmail(String email);
+}