adding https://github.com/noah1510/unit-system to library list (#306)

* adding https://github.com/noah1510/unit-system to library list

* using a separate repo for arduino file structure

Author: noasakurajin

repositories.txt

@@ -4117,3 +4117,4 @@ https://github.com/SergeSkor/SSVQueueStackArray
 https://github.com/SergeSkor/SSVWaitForStringInStream
 https://github.com/khoih-prog/ESP32_C3_TimerInterrupt
 https://github.com/guttih/DisplayMenu
+https://github.com/noah1510/unit-system-adruino