improve

src/app/services/chat/nf.service.ts

@@ -1,9 +1,14 @@
 import { Injectable } from '@angular/core';
+import { MessageService } from './message.service';
+import { RoomService } from './room.service';
 
 @Injectable({
   providedIn: 'root'
 })
 export class NfService {
 
+  beforeSendAttachment  = (message: MessageService, room?: RoomService): Promise<boolean> => new Promise ((resolve, reject)=> (resolve(true)))
+
+
   constructor() { }
 }