Create Service, Entity and Repository for Client and Location. Client add test to BDD done

src/main/java/fr/eni/demo/dal/ClientRepository.java

@@ -0,0 +1,9 @@
+package fr.eni.demo.dal;
+
+import fr.eni.demo.bo.Client;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface ClientRepository extends JpaRepository<Client, Integer> {
+}