Update repositories.txt

Author: German-source

repositories.txt

@@ -5,6 +5,7 @@ https://github.com/RileyCornelius/FmtLib-Arduino
 https://github.com/ntirushwajeanmarc/CircuitNotion
 https://github.com/SibEnergy/RTC_DS1302
 https://github.com/SibEnergy/TelegramMess
+https://github.com/German-source/MicroOS
 https://github.com/flashstacks06/SimpleMenu.git
 https://github.com/anaveo/KL1508CW
 https://github.com/gavinlyonsrepo/ERM19264_UC1609_TEXT