Add HandaDigitalSpeaker library

[DavinderHanda]

This PR adds the HandaDigitalSound library for ESP32. A simple ESP32 sound library using LEDC for SmartElex digital speaker
Author: Davinder Handa
Version: 1.0.0
Repository: https://github.com/DavinderHanda/HandaDigitalSound

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/DavinderHanda/HandaDigitalSpeaker:

Linting library in HandaDigitalSpeaker
INFO: No header file found matching library name (HandaDigitalSpeaker.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: Unable to load the library.properties url field: 404 Not Found                                        
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format
         (Rule LP042)                                                                                          
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, 2 WARNINGS

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Linting sketch in HandaDigitalSpeaker/examples/Demo_AllSounds

Linter results for project: no errors or warnings

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Linter results for projects: 0 ERRORS, 2 WARNINGS

[github-actions]

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