Add Lego WeDo 2.0 extension to library

src/lib/libraries/extensions/index.js

 import penImage from './pen.png';
+import wedoImage from './wedo.png';
 
 export default [
     {
@@ -7,5 +8,12 @@ export default [
         iconURL: penImage,
         description: 'Draw with your sprites.',
         featured: true
+    },
+    {
+        name: 'Lego WeDo 2.0',
+        extensionURL: 'wedo2',
+        iconURL: wedoImage,
+        description: 'Build with motors and sensors.',
+        featured: true
     }
 ];