Update repositories.txt (#6090)

Author: danmowehhuk

repositories.txt

@@ -1864,6 +1864,7 @@ https://github.com/danilopinotti/Battery18650Stats
 https://github.com/danja/TM1638lite
 https://github.com/danmowehhuk/AD75019
 https://github.com/danmowehhuk/Eventuino
+https://github.com/danmowehhuk/TestTool
 https://github.com/DanNixon/ArduinoUniversalInput
 https://github.com/DanNixon/NeoNextion
 https://github.com/Danny24/Smart-Motor-Driver-SAMI-Library