PlatformIO platform package for ArteryTek AT32 MCUs

Installation:

1. Click "PlatformIO Core CLI" from VSCode PlatformIO Panel -> Quick Access -> Miscellaneous.
2. Enter below install commands:

   pio pkg install -g -p https://github.com/ArteryTek/platform-arterytekat32

When you are using under Linux, before using, you need to install the udev rules for OpenOCD

1. Copy the 60-openocd.rules file under tool-openocd-at32 package to /etc/udev/rules.d/ directory.

   sudo cp ~/.platformio/packages/tool-openocd-at32/contrib/60-openocd.rules  /etc/udev/rules.d/

2. Refresh the udev rules.

   sudo udevadm control --reload-rules && sudo udevadm trigger