add method to create timestamp and chatMessage

src/Model/chatModel.ts

@@ -1,5 +1,19 @@
 // this file is responsible for managing chats and chat messages. objects are delegated to objectModel.ts.
 
+import { createTimestamp } from "../utility";
+
+// creation methods
+export function createChatMessage(channel: string, sender: string, body: string): ChatMessage {
+    return {
+        dataVersion: "v2",
+
+        channel,
+        sender,
+        body,
+        dateSent: createTimestamp(),
+    }
+}
+
 // types
 export interface ChatMessage {
     dataVersion: "v2";