Update repositories.txt (#3297)

Author: Obsttube

repositories.txt

@@ -23,6 +23,7 @@ https://github.com/kaiaai/micro_ros_arduino_kaia
 https://github.com/MrYsLab/Telemetrix4UnoR4
 https://github.com/Reefwing-Software/Reefwing-MPU6050
 https://github.com/Obsttube/CryptoAES_CBC
+https://github.com/Obsttube/AES_CMAC
 https://github.com/nfc-rfid-reader-sdk/MFRC522_PN512
 https://github.com/andrewhe-princeton/Iridium-GPP
 https://github.com/DIGI-EDGE/DPE-TRAM-GEN