Added a stub command
Squashed 'cstud/' content from commit f6ab0b6

git-subtree-dir: cstud
git-subtree-split: f6ab0b613407c8c2a1946dab7206048557b9d60c
Merge commit 'daaaaeee5835e21d87c787016594e29cde7c5e0a' as 'cstud'
Added downloading