Refactor, add extensive README.md, add future planning

bin/run_program

@@ -0,0 +1,13 @@
+#!/usr/bin/env php7.4
+<?php
+
+require_once __DIR__ . '/../vendor/autoload.php';
+
+if (!isset($argv[1])) {
+	print("Usage: bin/run_program <program number>\n");
+	exit(1);
+}
+
+$CNC6600 = require_once __DIR__ . '/bootstrap.php';
+$CNC6600->loadProgram($argv[1]);
+$CNC6600->execute();