add Adafruit_DACX578

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[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/adafruit/Adafruit_DACX578:

Linting library in Adafruit_DACX578
INFO: No header file found matching library name (Adafruit_DAC7578_Library.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: library.properties name Adafruit DAC7578 Library contains spaces. Although supported, best practices is to not 
         use spaces.                                                                                                    
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format         
         (Rule LP015)                                                                                                   
WARNING: Library name Adafruit DAC7578 Library contains "library". This is superfluous.                        
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format
         (Rule LP016)                                                                                          
WARNING: The library.properties paragraph field repeats the sentence field. These are displayed together so redundancy  
         is not needed.                                                                                                 
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format         
         (Rule LP036)                                                                                                   

Linter results for project: 0 ERRORS, 3 WARNINGS

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Linting sketch in Adafruit_DACX578/examples/dac7578_sawwave

Linter results for project: no errors or warnings

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

Linting sketch in Adafruit_DACX578/examples/dac7578_sinewaves

Linter results for project: no errors or warnings

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

Linter results for projects: 0 ERRORS, 3 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/adafruit/Adafruit_DACX578/