Include Header files

Hello
I can compile the Program just fine, but I still have the red underscore wave, how can I get red of this

Have you made to convert it to a CPP file so that full intellisense works correctly? Works for me with a platformio.ini of

[env:esp32dev]
platform = espressif32
board = esp32dev
framework = arduino
lib_deps = 
    ESP_VS1053_Library
    SPI

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