docs: update guide url

curriculum/challenges/adddir.js

@@ -0,0 +1,17 @@
+var fs = require('fs');
+
+var directory = '';
+// Get list of .md files in current directory
+fs.readdirSync('./english').forEach(file1 => {
+  if (file1 != '.DS_Store') {
+    directory = './spanish/' + file1;
+    !fs.existsSync(directory) && fs.mkdirSync(directory);
+    fs.readdirSync('./english/' + file1).forEach(file2 => {
+      if (file2 != '.DS_Store') {
+        directory = './spanish/' + file1 + '/' + file2;
+        !fs.existsSync(directory) && fs.mkdirSync(directory);
+        console.log(file2);
+      }
+    });
+  }
+});