chore: add a library about SGP30

[Lesords]

No description provided.

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/Seeed-Studio/Seeed_Arduino_SGP30:

Linting library in Seeed_Arduino_SGP30
INFO: No header file found matching library name (Seeed_Arduino_SGP30.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 Seeed Arduino SGP30 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 name Seeed Arduino SGP30 contains "Arduino". This is superfluous.                             
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format
         (Rule LP014)                                                                                          
WARNING: library.properties name Seeed Arduino SGP30 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: 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)                                                                                                   
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, 5 WARNINGS

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

Linting sketch in Seeed_Arduino_SGP30/examples/absolute_humidity_example

Linter results for project: no errors or warnings

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

Linting sketch in Seeed_Arduino_SGP30/examples/base_example

Linter results for project: no errors or warnings

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

Linting sketch in Seeed_Arduino_SGP30/examples/baseline_operation_example

Linter results for project: no errors or warnings

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

Linter results for projects: 0 ERRORS, 5 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/Seeed-Studio/Seeed_Arduino_SGP30/