Added StatefulGSMLib

Author: tabahi

repositories.txt

@@ -305,6 +305,7 @@ https://github.com/x0x0200/VARSTEP_ultrasonic
 https://github.com/StefanHerald/Timing
 https://github.com/tdk-invn-oss/pressure.arduino.ICP201XX
 https://github.com/DigitalCodesign/MentorBit-Library
+https://github.com/tabahi/StatefulGSMLib/
 https://github.com/tabahi/ESP-Wifi-Config
 https://github.com/tabahi/TabahiConsole
 https://github.com/karolis1115/FTPduino