Update repositories.txt to add Arduino_Cellular

[cristidragomir97]

Added https://github.com/arduino-libraries/Arduino_Cellular

[github-actions]

❌ ERROR: Arduino Lint found errors with https://github.com/arduino-libraries/Arduino_Cellular:

Linting library in Arduino_Cellular
INFO: No header file found matching library name (Arduino_Cellular.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)                                                                                                      
ERROR: Missing version field in library.properties                                                           
       See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format
       (Rule LP019)                                                                                          
ERROR: Missing author field in library.properties                                                            
       See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format
       (Rule LP023)                                                                                          
ERROR: Missing maintainer field in library.properties                                                        
       See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format
       (Rule LP025)                                                                                          
WARNING: Unable to load the library.properties url field: 404 Not Found                                        
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format
         (Rule LP042)                                                                                          
WARNING: library.properties depends field item(s) TinyGsm not found in the Library Manager index.              
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format
         (Rule LP048)                                                                                          

Linter results for project: 3 ERRORS, 2 WARNINGS

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

Linting sketch in Arduino_Cellular/examples/HTTPClient

Linter results for project: no errors or warnings

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

Linting sketch in Arduino_Cellular/examples/HTTPSClient

Linter results for project: no errors or warnings

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

Linting sketch in Arduino_Cellular/examples/ModemTerminal

Linter results for project: no errors or warnings

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

Linting sketch in Arduino_Cellular/examples/ReceiveSMS

Linter results for project: no errors or warnings

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

Linting sketch in Arduino_Cellular/examples/SendSMS

Linter results for project: no errors or warnings

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

Linting sketch in Arduino_Cellular/examples/TimeAndLocation

Linter results for project: no errors or warnings

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

Linter results for projects: 3 ERRORS, 2 WARNINGS

[github-actions]

Thanks for your interest in contributing to the Arduino Library Manager index @cristidragomir97
Please resolve the error(s) mentioned in the previous comment.

After resolving the issue, trigger this check again by doing one of the following:

• Commit the required change to the branch you submitted this pull request from.
• Comment here, mentioning @ArduinoBot in the comment.

❗ NOTE: It is not necessary to open a new pull request. ❗

More information:
https://github.com/arduino/library-registry/blob/main/README.md#if-the-problem-is-with-the-pull-request

[sebromero]

@ArduinoBot please take another look

[github-actions]

Hello! I'm checking your submission again.

[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/Arduino_Cellular/