Update repositories.txt DUE-ModbusDMA

[NitrofMtl]

Adding NitrofMtl/DUE-ModbusDMA to library registry

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/NitrofMtl/DUE-ModbusDMA:

Linting library in DUE-ModbusDMA
WARNING: library.properties depends field item(s) DUERS485DMA not found in the Library Manager index.          
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format
         (Rule LP048)                                                                                          
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, 2 WARNINGS

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Linting sketch in DUE-ModbusDMA/examples/RTU/ModbusRTUClientKitchenSink

Linter results for project: no errors or warnings

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Linting sketch in DUE-ModbusDMA/examples/RTU/ModbusRTUClientParameters

Linter results for project: no errors or warnings

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Linting sketch in DUE-ModbusDMA/examples/RTU/ModbusRTUClientToggle

Linter results for project: no errors or warnings

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Linting sketch in DUE-ModbusDMA/examples/RTU/ModbusRTUServerKitchenSink

Linter results for project: no errors or warnings

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Linting sketch in DUE-ModbusDMA/examples/RTU/ModbusRTUServerLED

Linter results for project: no errors or warnings

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Linting sketch in DUE-ModbusDMA/examples/RTU/ModbusRTUTemperatureSensor

Linter results for project: no errors or warnings

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Linting sketch in DUE-ModbusDMA/examples/TCP/EthernetModbusClientToggle

Linter results for project: no errors or warnings

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Linting sketch in DUE-ModbusDMA/examples/TCP/EthernetModbusServerLED

Linter results for project: no errors or warnings

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Linting sketch in DUE-ModbusDMA/examples/TCP/WiFiModbusClientToggle

Linter results for project: no errors or warnings

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Linting sketch in DUE-ModbusDMA/examples/TCP/WiFiModbusServerLED

Linter results for project: no errors or warnings

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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/NitrofMtl/DUE-ModbusDMA/