Add PR welcoming badge

[open-source-explorer]

Summary

Add PR welcoming badge to the README file

[facebook-github-bot]

Thank you for your pull request and welcome to our community. We require contributors to sign our Contributor License Agreement, and we don't seem to have you on file. In order for us to review and merge your code, please sign up at https://code.facebook.com/cla. If you are contributing on behalf of someone else (eg your employer), the individual CLA may not be sufficient and your employer may need the corporate CLA signed.

If you have received this in error or have any questions, please contact us at cla@fb.com. Thanks!

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[open-source-explorer]

@SimenB Hope it is fine now 👍

[codecov-io]

Codecov Report

Merging #7340 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #7340   +/-   ##
=======================================
  Coverage   66.69%   66.69%           
=======================================
  Files         241      241           
  Lines        9346     9346           
  Branches        6        5    -1     
=======================================
  Hits         6233     6233           
  Misses       3110     3110           
  Partials        3        3

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[open-source-explorer]

@thymikee What do you think now?

[SimenB]

Thanks!

[github-actions]

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