Update repositories.txt

[aikopras]

Added: https://github.com/aikopras/AP_DCC_Decoder_Core

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/aikopras/AP_DCC_Decoder_Core:

Linting library in AP_DCC_Decoder_Core
WARNING: library.properties depends field item(s) AP_DCC_library 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: 0 ERRORS, 1 WARNINGS

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Linting sketch in AP_DCC_Decoder_Core/examples/BasicDecoder

Linter results for project: no errors or warnings

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Linting sketch in AP_DCC_Decoder_Core/examples/Button/LongPress

Linter results for project: no errors or warnings

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Linting sketch in AP_DCC_Decoder_Core/examples/Button/SimpleOnOff

Linter results for project: no errors or warnings

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Linting sketch in AP_DCC_Decoder_Core/examples/Button/Toggle

Linter results for project: no errors or warnings

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Linting sketch in AP_DCC_Decoder_Core/examples/LED/DCC

Linter results for project: no errors or warnings

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Linting sketch in AP_DCC_Decoder_Core/examples/LED/Fade

Linter results for project: no errors or warnings

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Linting sketch in AP_DCC_Decoder_Core/examples/LED/Flash

Linter results for project: no errors or warnings

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Linting sketch in AP_DCC_Decoder_Core/examples/LED/Flash-invert

Linter results for project: no errors or warnings

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Linting sketch in AP_DCC_Decoder_Core/examples/LED/on_off

Linter results for project: no errors or warnings

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Linting sketch in AP_DCC_Decoder_Core/examples/LED/toggle

Linter results for project: no errors or warnings

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Linting sketch in AP_DCC_Decoder_Core/examples/Relay

Linter results for project: no errors or warnings

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Linting sketch in AP_DCC_Decoder_Core/examples/Timer/Blink-Led

Linter results for project: no errors or warnings

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Linter results for projects: 0 ERRORS, 1 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/aikopras/AP_DCC_Decoder_Core/