"Auto Build Marlin" provides a one-button interface to build and upload Marlin Firmware to your selected MOTHERBOARD, removing the need to edit your platformio.ini file or scroll through a long list of Marlin environments.
When installing "Auto Build Marlin" you'll also be prompted to install the PlatformIO extension. This is required for "Auto Build Marlin" to function.
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Open up the downloaded Marlin Firmware project folder (NOT the "Marlin" folder within) in Visual Studio Code. (You may also use the Import Project… option from the "PlaformIO Home" page.)
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With Marlin open, the "File Explorer" should be firmly rooted in your Marlin Firmware folder:
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Click the Marlin Auto Build icon
in the Activities Bar (on the left side of Visual Studio Code window) to bring up the Marlin Auto Build options bar.
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Click one of the four icons
Icon Action 
Start Marlin Build to test your Marlin build 
Start Marlin Upload to install Marlin on your board 
Start Marlin Upload (traceback) to install Marlin with debugging 
Start Marlin Clean to delete old build files
