Add Henhen1227's BluetoothSerial Library (#3244)

Co-authored-by: Henry Abrahamsen <[email protected]>

Author: per1234

repositories.txt

@@ -1,6 +1,7 @@
 https://github.com/tedtoal/Button_TT
 https://github.com/geekblemaker/Geekble_note2freq
 https://github.com/Reefwing-Software/Reefwing-PWM
+https://github.com/hen1227/bluetooth-serial
 https://github.com/misaproyectil/digitalIO
 https://github.com/misaproyectil/GD3300
 https://github.com/misaproyectil/Sprite_Serial_Control