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

src/main/java/fr/eni/demo/bll/ClientService.java

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+package fr.eni.demo.bll;
+
+import fr.eni.demo.bo.Client;
+import fr.eni.demo.dal.ClientRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class ClientService {
+
+  @Autowired
+  private ClientRepository clientRepository;
+
+  public void add(Client client) {
+    if (client.getPrenom() == null) {
+      Client clientTest = new Client();
+      clientTest.setPrenom("Olivier");
+      clientTest.setNom("Parpaillon");
+      clientTest.setEmail("olivier@test.fr");
+      clientRepository.save(clientTest);
+    } else {
+      clientRepository.save(client);
+    }
+  }
+}