Update repositories.txt

[redPanther]

add CQRobotTDS, library for using a CQRobot TDS sensor

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/redPanther/CQRobotTDS:

Linting library in CQRobotTDS
WARNING: No example sketches found. Please provide examples.                                      
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#library-examples
         (Rule LD004)                                                                             

Linter results for project: 0 ERRORS, 1 WARNINGS

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[github-actions]

Your submission has now been accepted! Thanks for your contribution to the Arduino Library Manager index.

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You can check the logs from the Library Manager indexer for your library(s) here:
http://downloads.arduino.cc/libraries/logs/github.com/redPanther/CQRobotTDS/