added jwt auth to service

src/main/java/zw/qantra/tm/domain/repositories/UserRepository.java

@@ -0,0 +1,16 @@
+package zw.qantra.tm.domain.repositories;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+import zw.qantra.tm.domain.models.User;
+
+import java.util.Optional;
+
+@Repository
+public interface UserRepository extends JpaRepository<User, Long> {
+    Optional<User> findByUsername(String username);
+    Optional<User> findByEmail(String email);
+    Optional<User> findByPhone(String phone);
+    boolean existsByUsername(String username);
+    boolean existsByEmail(String email);
+}