Create README.md

Author: AGlass0fMilk

README.md

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+# mbed-mcuboot-demo
+Demo of mcuboot with Mbed
+
+Initialize the mcuboot submodule:
+`git submodule init && git submodule update`
+
+Pull the most recent mcuboot mbed port:
+`cd mcuboot && git checkout mbed-port && git pull`
+
+Build the mbed program:
+```
+mbed target NRF52840_DK
+mbed toolchain GCC_ARM
+mbed compile
+```
+
+Flash bootloader application to the NRF52840_DK.
+
+Then flash the included `signed-usb.hex` to the NRF52840_DK.
+
+This enables drag-and-drop programming of the target over USB MSD.
+
+Plug the NRF52840_DK's target USB connector into your laptop. It should show up as a 2MB flash drive.
+
+Copy the `signed.bin` binary over to the flash drive. You can watch serial output for progress of flashing.
+
+After a while the target should disconnect and start flashing itself... the on-board LED3 should start to blink when done.