Add build scripts

build_adafruit_libs.sh

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+#!/bin/sh
+# build_adafruit_libs.sh - build CircuitPack packages for Adafruit libraries
+
+if [ "$1" = "" ]; then
+    echo "usage: $0 <path_to_unzipped_adafruit_libraries>" >&2
+    exit 2
+fi
+
+for file_name in $(ls $1/lib); do
+    rm -rf board
+    mkdir -p board/lib
+    package_name=$(basename -s .mpy $file_name)
+    cp -r $1/lib/$file_name board/lib/
+    python3 cppack.py $package_name board
+    rm -r board
+done

build_package.sh

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+#!/bin/sh
+# build_package.sh - build a CircuitPack package for CircuitPack
+# Requires mpy-cross installed in $PATH
+
+mpy-cross 2>/dev/null
+if [ "$?" = 127 ]; then
+    echo 'error: `mpy-cross` must be installed; get it from the link below and install it in a directory in your $PATH' >&2
+    echo 'https://learn.adafruit.com/welcome-to-circuitpython/library-file-types-and-frozen-libraries#creating-an-mpy-file-3118108' >&2
+    exit 2
+fi
+
+rm -rf board
+mkdir -p board/lib
+mpy-cross circuitpack.py
+mv circuitpack.mpy board/lib/
+python3 cppack.py circuitpack board
+rm -r board