Feat/finish timer component

[s-gbz]

Closes #7 Closes #29

Reviewer's task:

• [x] I didn't see no code smells
• [x] The live preview works as expected -> no regressions found

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Name	Status	Preview	Updated
screenario-react	✅ Ready (Inspect)	Visit Preview	Aug 15, 2022 at 4:11AM (UTC)

[s-gbz]

TODO: add license