feat(rating): initial implementation

[arturmiz]

Closes #4

[codecov]

Codecov Report

Merging #44 into master will increase coverage by 0.13%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
+ Coverage   98.05%   98.19%   +0.13%     
==========================================
  Files          25       27       +2     
  Lines         103      111       +8     
  Branches       19       20       +1     
==========================================
+ Hits          101      109       +8     
  Misses          2        2

Impacted Files	Coverage Δ
src/components/rating/Rating.vue	100% <100%> (ø)
src/components/rating/index.js	100% <100%> (ø)

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