Adding X-NUCLEO-53L7A1 examples

[davideq]

No description provided.

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/stm32duino/X-NUCLEO-53L7A1:

Linting library in X-NUCLEO-53L7A1
INFO: No header file found matching library name (STM32duino_X-NUCLEO-53L7A1.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 value STM32duino X-NUCLEO-53L7A1 is longer than the recommended length of 16           
         characters.                                                                                                    
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format         
         (Rule LP010)                                                                                                   
WARNING: library.properties name STM32duino X-NUCLEO-53L7A1 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)                                                                                                   

Linter results for project: 0 ERRORS, 2 WARNINGS

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Linting sketch in X-NUCLEO-53L7A1/examples/X_NUCLEO_53L7A1_HelloWorld

Linter results for project: no errors or warnings

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Linting sketch in X-NUCLEO-53L7A1/examples/X_NUCLEO_53L7A1_MultiSensorRanging

Linter results for project: no errors or warnings

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

Linting sketch in X-NUCLEO-53L7A1/examples/X_NUCLEO_53L7A1_ThresholdDetection

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/stm32duino/X-NUCLEO-53L7A1/