feat: Add button component to shared/ui

[yurisldk]

It fixes #3

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01 ⚠️

Comparison is base (d4e6ad9) 99.92% compared to head (a5a866b) 99.92%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #4      +/-   ##
==========================================
- Coverage   99.92%   99.92%   -0.01%     
==========================================
  Files          72       71       -1     
  Lines        2715     2690      -25     
  Branches      256      249       -7     
==========================================
- Hits         2713     2688      -25     
  Misses          2        2              

Impacted Files	Coverage Δ
src/entities/article/index.ts	100.00% <ø> (ø)
src/entities/profile/index.ts	100.00% <ø> (ø)
.../favorite-article-button/FavoriteArticleButton.tsx	100.00% <100.00%> (ø)
...avorite-article-button/UnfavoriteArticleButton.tsx	100.00% <100.00%> (ø)
...profile/ui/follow-user-button/FollowUserButton.tsx	100.00% <100.00%> (ø)
...ile/ui/unfollow-user-button/UnfollowUserButton.tsx	100.00% <100.00%> (ø)
src/shared/ui/button/Button.tsx	100.00% <100.00%> (ø)
src/shared/ui/button/index.ts	100.00% <100.00%> (ø)

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