Add Modulino library

[facchinm]

No description provided.

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/arduino-libraries/Modulino:

Linting library in Modulino
WARNING: Library name Modulino is missing the "Arduino_" prefix. The names of all new official libraries must have this 
         prefix.                                                                                                        
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format         
         (Rule LP013)                                                                                                   
WARNING: No readme found. Please document your library.                                                                                
         See:                                                                                                                          
         https://docs.github.com/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-readmes
         (Rule LD001)                                                                                                                  

Linter results for project: 0 ERRORS, 2 WARNINGS

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Linting sketch in Modulino/examples/AddressChanger

Linter results for project: no errors or warnings

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Linting sketch in Modulino/examples/Button2Integration

Linter results for project: no errors or warnings

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Linting sketch in Modulino/examples/EncoderSetter

Linter results for project: no errors or warnings

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Linting sketch in Modulino/examples/FirmwareUpdater

Linter results for project: no errors or warnings

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Linting sketch in Modulino/examples/Modulino_PlugNPlay

Linter results for project: no errors or warnings

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

Linter results for projects: 0 ERRORS, 2 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/arduino-libraries/Modulino/