add spring security and token management

src/main/java/com/iconplus/smartproc/repository/UsersRepository.java

@@ -4,7 +4,11 @@ import com.iconplus.smartproc.model.entity.Users;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.stereotype.Repository;
 
+import java.util.Optional;
+
 @Repository
 public interface UsersRepository extends JpaRepository<Users, Long> {
+
+    Optional<Users> findByEmailAndDeletedFalse(String email);
     
 }