Simplest Zephyr module + bacnet_stack config and hello sample

zephyr/samples/hello_bacnet_stack/src/main.c

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2020 Legrand North America, LLC.
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <zephyr.h>
+#include <sys/printk.h>
+
+void main(void)
+{
+    printk("Hello BACnet-Stack! %s\n", CONFIG_BOARD);
+}