Update repositories.txt (#3282)

Author: XbergCode

repositories.txt

@@ -2229,6 +2229,7 @@ https://github.com/Wolodia-M/timersapi-library
 https://github.com/WonderCRM/CRMui3
 https://github.com/WorldFamousElectronics/PulseSensorPlayground
 https://github.com/XasWorks/Circios-Library
+https://github.com/XbergCode/MillisCounter
 https://github.com/XbergCode/DigitSeparator
 https://github.com/XbergCode/Uptime
 https://github.com/XiloXL/Powerbaas