Resolve "Create entities for mock bank"

• Should create entities for the mock bank
• Include right data types and id

Closes #31 (closed)

src/main/java/idatt2106/systemutvikling/sparesti/mockBank/dao/AccountDAO.java

+package idatt2106.systemutvikling.sparesti.mockBank.dao;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.SequenceGenerator;
+import jakarta.validation.constraints.NotNull;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+@Entity
+@NoArgsConstructor
+@Getter
+@Setter
+public class AccountDAO {
+
+  @Id
+  @NotNull
+  @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "accountIdGenerator")
+  @SequenceGenerator(name = "accountIdGenerator", sequenceName = "account_sequence",
+      allocationSize = 1, initialValue = 12313123)
+  private Long accountNr;
+
+  @ManyToOne
+  @JoinColumn(name = "username", referencedColumnName = "username")
+  private CustomerDAO customerDAO;
+
+
+}