release v2.0.0

[YutHelloWorld]

1. build with create-react-app
2. add tests

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@18dabb5). Click here to learn what that means.
The diff coverage is 42.1%.

@@            Coverage Diff            @@
##             master      #35   +/-   ##
=========================================
  Coverage          ?   55.03%           
=========================================
  Files             ?       20           
  Lines             ?      149           
  Branches          ?       24           
=========================================
  Hits              ?       82           
  Misses            ?       56           
  Partials          ?       11

Impacted Files	Coverage Δ
src/routes/Home/components/HomeView.js	100% <ø> (ø)
src/index.js	0% <0%> (ø)
src/routes/Zen/index.js	0% <0%> (ø)
src/layouts/components/Navbar.js	33.33% <0%> (ø)
src/utils/registerServiceWorker.js	10.34% <10.34%> (ø)
src/layouts/containers/CustomHome.js	80% <100%> (ø)
src/layouts/containers/Layout.js	100% <100%> (ø)
src/components/App.js	100% <100%> (ø)
src/components/PrivateRoute.js	100% <100%> (ø)
src/routes/Login/containers/Login.js	100% <100%> (ø)
... and 5 more

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