Update repositories.txt (#4715)

Author: maarten-pennings

repositories.txt

@@ -18,6 +18,7 @@ https://github.com/raghulrajg/OTAUpdateManager
 https://github.com/makerlabvn/makerlabvnlib
 https://github.com/makerlabvn/Makerlabvn_kit_CIA0_BOT
 https://github.com/makerlabvn/mke-s01-ultrasonic-sensor
+https://github.com/maarten-pennings/ENS210
 https://github.com/Herwig9820/Justina_interpreter
 https://github.com/BrainCoTech/brain_arduino
 https://github.com/cschorn01/PlugAndPlayForLoRa