chore: setup monorepo with yarn workspaces

[satya164]

No description provided.

[codecov-io]

Codecov Report

Merging #38 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #38   +/-   ##
=======================================
  Coverage   93.35%   93.35%           
=======================================
  Files          21       21           
  Lines         376      376           
  Branches       91       91           
=======================================
  Hits          351      351           
  Misses         24       24           
  Partials        1        1

Impacted Files	Coverage Δ
packages/core/src/NavigationContext.tsx	100% <ø> (ø)
packages/core/src/NavigationBuilderContext.tsx	100% <ø> (ø)
packages/core/src/useRegisterNavigator.tsx	100% <ø> (ø)
packages/core/src/EnsureSingleNavigator.tsx	91.66% <ø> (ø)
packages/core/src/NavigationContainer.tsx	100% <ø> (ø)
...ges/core/src/__tests__/__fixtures__/MockRouter.tsx	96.42% <ø> (ø)
packages/core/src/StaticContainer.tsx	100% <ø> (ø)
packages/core/src/useNavigationBuilder.tsx	100% <ø> (ø)
packages/core/src/SceneView.tsx	93.33% <ø> (ø)
packages/core/src/useOnRouteFocus.tsx	91.66% <ø> (ø)
... and 11 more

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[thymikee]

After this is done, feel free to setup lerna for less import mapping and easier publishing. The config is pretty simple with workspaces: https://github.com/react-native-community/cli/blob/master/lerna.json