Add SecureMQTT

[RaHoni]

No description provided.

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/PrivateHomeIoT/SecureMQTT:

Linting library in SecureMQTT
WARNING: Missing architectures field in library.properties                                                     
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format
         (Rule LP043)                                                                                          
WARNING: library.properties depends field item(s) ESP8266TrueRandom (>=1.0) not found in the Library Manager index.
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format    
         (Rule LP048)                                                                                              
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, 3 WARNINGS

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Linting sketch in SecureMQTT/examples/PrivateHome

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/PrivateHomeIoT/SecureMQTT/