accidentally added submodule instead of subtree
Add 'ECSE211/' from commit 'aeb88be6037d0b6ccaacae7b541323339fccaa8f'

git-subtree-dir: ECSE211
git-subtree-mainline: 818c7ce140bcc606a7376342ab31eb7f4cb7400b
git-subtree-split: aeb88be6037d0b6ccaacae7b541323339fccaa8f