Proper SWD connector

[iwasz]

Not a bug or anything, but I'm using your boards, and I wish they had a standard SWD connector (or simply a footprint!) so you could hook up NXP's MCU link easier.

• https://developer.arm.com/documentation/101636/0100/Debug-and-Trace/JTAG-SWD-Interface
• https://www.nxp.com/design/design-center/software/development-software/mcuxpresso-software-and-tools-/mcu-link-debug-probe:MCU-LINK