Initialize codecov.yml

[kevinputera]

This codecov.yml file should cause:

1. Our codecov badge on README.md to be green (I set the threshold for green badge from 60% to 100%)
2. Codecov's commit check to pass even if a PR causes our repo's coverage to drop (at most 3%)

[codecov[bot]]

Codecov Report

Merging #422 into master will not change coverage by %. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #422   +/-   ##
=========================================
  Coverage     67.08%   67.08%           
  Complexity      515      515           
=========================================
  Files            97       97           
  Lines          2008     2008           
  Branches        199      199           
=========================================
  Hits           1347     1347           
  Misses          576      576           
  Partials         85       85           

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Continue to review full report at Codecov.

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[netlify[bot]]

Deploy preview for notably-app ready!

Built with commit 03d9a31de607de1f05d57f6e4c124f1862d50028

https://deploy-preview-422--notably-app.netlify.com

[netlify[bot]]

Deploy preview for notably-app ready!

Built with commit 05bbd34bb39c37df7ab0ada10dce45ff43f5e5e9

https://deploy-preview-422--notably-app.netlify.com