Updated Readme with missing yarn build command.

[Saajan]

📜 Documentation

[ghost]

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[codecov]

Codecov Report

Merging #156 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #156   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files          81     81           
  Lines        1044   1044           
  Branches      258    258           
=====================================
  Hits         1044   1044

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