Update README.md

Author: nopnop2002

README.md

@@ -5,6 +5,8 @@ __From ESP-IDF V5.2, official sample code for WIFI_MODE_APSTA has been added.__
 __So this repository will be changed to an archive.__   
 __Please use official samples from now on.__   
 
+---
+
 esp-idf contains examples in station mode (WIFI_MODE_STA) and softap mode (WIFI_MODE_AP), but there are no examples in apsta mode (WIFI_MODE_APSTA).
 
 I referred [here](https://esp32.com/viewtopic.php?t=10619).