Added readline function, started work on shops, added some comments, made main menu and a bit of the start.

files/node_modules/readline-sync/lib/encrypt.js

@@ -0,0 +1,24 @@
+/*
+ * readlineSync
+ * https://github.com/anseki/readline-sync
+ *
+ * Copyright (c) 2019 anseki
+ * Licensed under the MIT license.
+ */
+
+var cipher = require('crypto').createCipher(
+      process.argv[2] /*algorithm*/, process.argv[3] /*password*/),
+  stdin = process.stdin,
+  stdout = process.stdout,
+  crypted = '';
+
+stdin.resume();
+stdin.setEncoding('utf8');
+stdin.on('data', function(d) {
+  crypted += cipher.update(d, 'utf8', 'hex');
+});
+stdin.on('end', function() {
+  stdout.write(crypted + cipher.final('hex'), 'binary', function() {
+    process.exit(0);
+  });
+});