Add scripts for using ch341a programmer

scripts/_ch341a.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+if [ ! -d "models/${MODEL}" ]
+then
+  echo "model '${MODEL}' not found" >&2
+  exit 1
+fi
+MODEL_DIR="$(realpath "models/${MODEL}")"
+
+if [ ! -f "${MODEL_DIR}/chip.txt" ]
+then
+  echo "model '${MODEL}' does not have chip.txt" >&2
+  exit 1
+fi
+CHIP="$(cat "${MODEL_DIR}/chip.txt")"