-add start direct message method from mobile App

- more improvements

src/app/services/chat.service.ts

@@ -132,7 +132,20 @@ export class ChatService {
       let opts = { 
         headers: this.headers,
       }
-      return this.http.post(environment.apiChatUrl+'im.close', body, opts);
+      return this.http.post(environment.apiChatUrl+'im.close', body, this.options);
+    }
+    createRoom(body:any){
+      return this.http.post(environment.apiChatUrl+'im.create', body, this.options);
+    }
+    getDirectMessage(roomId:string){
+      let params = new HttpParams();
+      params = params.set("roomId", roomId);
+    
+      let opts = { 
+        headers: this.headers, 
+        params: params 
+      }
+      return this.http.get(environment.apiChatUrl+'im.messages', opts);
     }
     
 }