fix: placeholder for datepicker

[ziegfiroyt]

• placeholder for datepicker
• "test:unit:output" command has been added to package.json for creating .jest.test.result.json
• placeholder has been defined in storybook

[codecov-io]

Codecov Report

Merging #42 into dev will not change coverage.
The diff coverage is 100%.

@@         Coverage Diff         @@
##            dev    #42   +/-   ##
===================================
  Coverage   100%   100%           
===================================
  Files        26     26           
  Lines       638    638           
  Branches     71     71           
===================================
  Hits        638    638

Impacted Files	Coverage Δ
src/components/DatePicker.tsx	100% <100%> (ø)	⬆️

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[y0c]

Good Thanks ! 👍