[Add] README.md 파일 작성 및 Codecov and Cypress Badge 추가

[saseungmin]

• Set code coverage in codecov.yml
• Set Cypress record dashboard in ci.yml

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@2d2fb28). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             main       #11   +/-   ##
========================================
  Coverage        ?   100.00%           
========================================
  Files           ?         1           
  Lines           ?         2           
  Branches        ?         0           
========================================
  Hits            ?         2           
  Misses          ?         0           
  Partials        ?         0           

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[cypress]

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Test summary

1 • 0 • 0 • 0

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Run details

Project	yarn-berry-example
Status	Passed
Commit	627614b ℹ️
Started	Oct 11, 2021 12:03 PM
Ended	Oct 11, 2021 12:04 PM
Duration	00:18 💡
OS	Linux Ubuntu - 20.04
Browser	Chrome 94

View run in Cypress Dashboard ➡️

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This comment has been generated by cypress-bot as a result of this project's GitHub integration settings. You can manage this integration in this project's settings in the Cypress Dashboard