Try to add online chat

src/main/java/site/easystartup/web/chat/dto/ChatMessageDto.java

@@ -0,0 +1,28 @@
+package site.easystartup.web.chat.dto;
+
+import lombok.Data;
+import site.easystartup.web.chat.domain.model.MessageStatus;
+
+import javax.validation.constraints.NotNull;
+import javax.validation.constraints.Size;
+import java.io.Serializable;
+import java.util.Date;
+
+@Data
+public class ChatMessageDto implements Serializable {
+    private long id;
+    private String chatId;
+    @NotNull
+    private String senderId;
+    @NotNull
+    private String recipientId;
+    @NotNull
+    private String senderName;
+    @NotNull
+    private String recipientName;
+    @NotNull
+    @Size(min = 1, max = 255, message = "Text should be no less 1 and no more 255 signs")
+    private String content;
+    private Date timestamp;
+    private MessageStatus status;
+}