ADD database integration & ADD simple dummy user entity

src/main/java/com/ddf/vodsystem/repositories/UserRepository.java

@@ -0,0 +1,9 @@
+package com.ddf.vodsystem.repositories;
+
+import com.ddf.vodsystem.entities.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface UserRepository extends JpaRepository<User, Long> {
+}