add composition/inheritance video to extra materials

kottans / frontend

:octocat: Kottans frontend course 🎓

https://kottans.org/frontend/

MIT License

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add composition/inheritance video to extra materials #140

Closed yevhenorlov closed 5 years ago

yevhenorlov commented 5 years ago

I really like this video for its fun and simple explanation of composition and inheritance concepts, so I propose we add it here as an extra material.