Add crystals and and try to use the export/import mechanism from ES6

src/helpers.js

@@ -0,0 +1,3 @@
+export function random_number(min, max) {
+    Math.floor((Math.random() * max) + min);
+};

src/index.html

@@ -8,6 +8,7 @@
     <nav>
       <ul>
         <li>Dust: <strong id="res-dust">0</strong></li>
+        <li>Crystals: <strong id="res-crystals">0</strong></li>
         <li>Time on this ateroid: <strong id="time">0 hours</strong></li>
       </ul>
     </nav>

src/main.js

@@ -1,8 +1,11 @@
+import random_number from './helpers';
+
 class Engine {
     constructor() {
         this.ticks = 0;
         this.resources = {
-            dust: 0
+            dust: 0,
+            crystals: 0
         }
     }
 
@@ -27,8 +30,15 @@ class Player {
     }
 }
 
+class Asteroid {
+    mine_resource() {
+        console.log(random_number(2, 10));
+    }
+}
+
 var engine = new Engine();
 var player = new Player(engine);
+var current_asteroid = new Asteroid();
 
 var bootstrap = function() {
     setInterval(() => {