Squashed 'app/' changes from ff4dde4..d690a0b

d690a0b README
e21f59d Added effects module with highlight effect

git-subtree-dir: app
git-subtree-split: d690a0b417367294343b8777a0ae199ff1788d19
Merge commit 'fa026e599e868fbd8566cff9678aef054c33b73d'