Start work on firmware build scripts

build/dimensioner.sh

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+#!/bin/bash
+
+mkdir workspace
+cd workspace
+git clone https://github.com/micropython/micropython.git
+cd micropython
+make -C mpy-cross
+cd ports/rp2
+make submodules
+make BOARD=RPI_PICO FROZEN_MANIFEST=../../../../src/dimensioner/manifest.py

src/dimensioner/manifest.py

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+# Build manifest for PostalPoint Parcel Dimensioner
+require("usb-device-hid")
+require("ssd1306")
+module("dimensioner_utils.py")
+module("dimensioner_screen.py")
+module("ssd1306big.py")
+module("main.py")