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

src/main/java/fr/eni/demo/bo/Client.java

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+package fr.eni.demo.bo;
+
+import jakarta.persistence.*;
+import lombok.*;
+
+@AllArgsConstructor
+@NoArgsConstructor
+@Getter
+@Setter
+@ToString
+@Builder
+
+@Entity
+@Table(name="CLIENTS")
+public class Client {
+  @Id
+  @GeneratedValue(strategy = GenerationType.IDENTITY)
+  @Column(name = "CLIENT_ID")
+  private Integer id;
+
+  @Column(name= "LAST_NAME", nullable = false, length = 90)
+  private String nom;
+
+  @Column(name= "FIRST_NAME", nullable = false, length = 150)
+  private String prenom;
+
+  @Column(nullable = false, unique = true)
+  private String email;
+
+  @OneToOne
+  @JoinColumn(name = "LOCATION_ID")
+  private Location location;
+}