Added riddles outline.

assets/riddles.json

@@ -0,0 +1,6 @@
+[
+	{
+		"riddle": "What has to be broken before you can use it?",
+		"answer": "An egg."
+	}
+]

src/games/riddle.js

@@ -0,0 +1,12 @@
+'use strict';
+
+const riddles = require('../../assets/riddles.json');
+
+const open = new Map();
+
+function onCommand(args, context) {
+}
+
+module.exports = {
+	onCommand,
+};