added build script for CP

build-cp.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+set -e
+nproc=$(python -c 'import multiprocessing; print(multiprocessing.cpu_count())')
+HERE="$(dirname -- "$(readlink -f -- "${0}")" )"
+[ -e circuitpython/py/py.mk ] || (git clone --depth 100 --branch 6.0.x https://github.com/adafruit/circuitpython && cd circuitpython && git submodule update --init)
+rm -rf circuitpython/extmod/ulab; ln -s "$HERE" circuitpython/extmod/ulab
+make -C circuitpython/mpy-cross -j$nproc
+make -C circuitpython/ports/unix -j$nproc deplibs
+make -C circuitpython/ports/unix -j$nproc
+
+if ! env MICROPY_MICROPYTHON=circuitpython/ports/unix/micropython circuitpython/tests/run-tests -d tests; then
+    for exp in *.exp; do
+        testbase=$(basename $exp .exp);
+        echo -e "\nFAILURE $testbase";
+        diff -u $testbase.exp $testbase.out;
+    done
+    exit 1
+fi
+
+(cd circuitpython && sphinx-build -E -W -b html . _build/html)