Update README.md

README.md

@@ -1,8 +1,15 @@
 # IP-Messenger
 ![](screenshot/opening.png)![](screenshot/o2o_panel.png)
+![](screenshot/ipm_file_transfer.png)
 ### [See more](screenshot/)
-
-## [Download](https://github.com/avoidcloud/IP-Messenger/releases/)
+## Before Use:
+   File transferring system only can use in signle chat or one-to-on system.
+   For transfer file messenger will create another socket with same host address; but the 
+   port will be create by using: senderSocket.port - 10
+   So be carefull about initial port for messenger socket connection.
+
+      Default file receive location Document/IP_Messenger
+      
 ### Licensed under Apache License 2.0
 
    Copyright 2018 Rafiul Islam
@@ -18,3 +25,5 @@
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
+
+## [Download IP Messenger](https://github.com/avoidcloud/IP-Messenger/releases/)