add DTOs

cqrs/src/main/java/com/iluwatar/cqrs/dto/AuthorDTO.java

@@ -0,0 +1,37 @@
+package com.iluwatar.cqrs.dto;
+
+public class AuthorDTO {
+
+  private String name;
+  private String email;
+  private String username;
+
+  public AuthorDTO(String name, String email, String username) {
+    super();
+    this.name = name;
+    this.email = email;
+    this.username = username;
+  }
+
+  public AuthorDTO() {
+    super();
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getEmail() {
+    return email;
+  }
+
+  public String getUsername() {
+    return username;
+  }
+
+  @Override
+  public String toString() {
+    return "AuthorDTO [name=" + name + ", email=" + email + ", username=" + username + "]";
+  }
+
+}

cqrs/src/main/java/com/iluwatar/cqrs/dto/BookDTO.java

@@ -0,0 +1,26 @@
+package com.iluwatar.cqrs.dto;
+
+public class BookDTO {
+
+  private String title;
+  private double price;
+
+  public BookDTO(String title, double price) {
+    super();
+    this.title = title;
+    this.price = price;
+  }
+
+  public BookDTO() {
+    super();
+  }
+
+  public String getTitle() {
+    return title;
+  }
+
+  public double getPrice() {
+    return price;
+  }
+
+}