Update repositories.txt

[phuongnamzz]

Add HLK-LD6002 library

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/phuongnamzz/HLK-LD6002:

Linting library in HLK-LD6002
INFO: No header file found matching library name (HLK-LD6002.h). Best practices are for primary header filename to match
      library name.                                                                                                     
      See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format            
      (Rule LS008)                                                                                                      
WARNING: No license file found.                                                                                                                 
         See:                                                                                                                                   
         https://docs.github.com/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/licensing-a-repository
         (Rule LD002)                                                                                                                           

Linter results for project: 0 ERRORS, 1 WARNINGS

-------------------

Linting sketch in HLK-LD6002/examples/LD6002Test

Linter results for project: no errors or warnings

-------------------

Linter results for projects: 0 ERRORS, 1 WARNINGS

[github-actions]

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

The library(s) will be available for installation via Library Manager within a day's time.

You can check the logs from the Library Manager indexer for your library(s) here:
http://downloads.arduino.cc/libraries/logs/github.com/phuongnamzz/HLK-LD6002/