Add Mini QOI Library

[shraiwi]

No description provided.

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/shraiwi/mini-qoi:

Linting library in mini-qoi
INFO: No header file found matching library name (Mini_QOI.h). Best practices are for primary header filename to match  
      library name. (Rule LS008)                                                                                        
WARNING: library.properties name Mini QOI contains spaces. Although supported, best practices is to not use spaces.     
         (Rule LP015)                                                                                                   
WARNING: No license file found. See:                                                                                                                  
         https://docs.github.com/en/free-pro-team@latest/github/creating-cloning-and-archiving-repositories/licensing-a-repository#detecting-a-license
         (Rule LD002)                                                                                                                                 

Linter results for project: 0 ERRORS, 2 WARNINGS

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Linting sketch in mini-qoi/examples/arduino_decoder

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/shraiwi/mini-qoi/