Update meta.yml

Author: geetanjalikhatri-rpfi

en/meta.yml

@@ -2,6 +2,7 @@
 title: Lost in space
 hero_image: images/lost-in-space.png
 description: Learn how to program your own animation!
+pdf: resources/rpfi-lost-in-space.pdf
 original_url: https://www.codeclubprojects.org/en-GB/scratch/lost-in-space
 listed: true
 copyedit: true
@@ -22,4 +23,4 @@ steps:
 - title: Challenge
   challenge: true
   completion:
-  - external
+  - external