add grayscale filter effect

Davidy22 / SkunkBooth

Text based command line webcam photobooth app

https://Davidy22.github.io/SkunkBooth/

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Closed vivekashok1221 closed 2 years ago

vivekashok1221 commented 2 years ago

Closes #91 , implemented grayscale effect.

Before filter:

After filter:

Menu:

Davidy22 commented 2 years ago

Looks fine, merging.