Update README.md

[pavankalyan1436]

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[pavankalyan1436]

@entity
public class Client {
@id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;

private String name;
private String email;
private String phone;

@ManyToOne
@JoinColumn(name = "advisor_id")
private FinancialAdvisor advisor;

@OneToOne(mappedBy = "client", cascade = CascadeType.ALL)
private Portfolio portfolio;

public Client() {}

public Client(String name, String email, String phone, FinancialAdvisor advisor, Portfolio portfolio) {
    this.name = name;
    this.email = email;
    this.phone = phone;
    this.advisor = advisor;
    this.portfolio = portfolio;
}

// Getters and setters

}

[pavankalyan1436]

@entity
public class Portfolio {
@id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;

@OneToOne
@JoinColumn(name = "client_id")
private Client client;

@OneToMany(mappedBy = "portfolio", cascade = CascadeType.ALL)
private List<Security> securities;

public Portfolio() {}

public Portfolio(Client client, List<Security> securities) {
    this.client = client;
    this.securities = securities;
}

// Getters and setters

}

[pavankalyan1436]

@entity
public class Portfolio {
@id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;

@OneToOne
@JoinColumn(name = "client_id")
private Client client;

@OneToMany(mappedBy = "portfolio", cascade = CascadeType.ALL)
private List<Security> securities;

public Portfolio() {}

public Portfolio(Client client, List<Security> securities) {
    this.client = client;
    this.securities = securities;
}

// Getters and setters

}

[pavankalyan1436]

@entity
public class Security {
@id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;

private String name;
private String category;
private String purchaseDate;
private Double purchasePrice;
private Integer quantity;

@ManyToOne
@JoinColumn(name = "portfolio_id")
private Portfolio portfolio;

public Security() {}

public Security(String name, String category, String purchaseDate, Double purchasePrice, Integer quantity, Portfolio portfolio) {
    this.name = name;
    this.category = category;
    this.purchaseDate = purchaseDate;
    this.purchasePrice = purchasePrice;
    this.quantity = quantity;
    this.portfolio = portfolio;
}

// Getters and setters

}