Update repositories.txt (arduino#2645)

Please add "STM32duino X-NUCLEO-NFC07A1" to the Library Manager.
Best Regards,
Carlo

Author: cparata

repositories.txt

@@ -5700,3 +5700,4 @@ https://github.com/jnthas/Improv-WiFi-Library
 https://github.com/teddokano/LEDDriver_NXP_Arduino
 https://github.com/pablomarquez76/ESP8266SAM_ES
 https://github.com/strid3r21/BeeDataLogger-Arduino-Helper
+https://github.com/stm32duino/X-NUCLEO-NFC07A1