Summary:
**what is the change?:**
Adding a document linking to the Facebook Open Source Code of Conduct,
for visibility and to meet Github community standards.
**why make this change?:**
Facebook Open Source provides a Code of Conduct statement for all
projects to follow.
Exposing the COC via a separate markdown file is a standard being
promoted by Github via the Community Profile in order to meet their Open
Source Guide's recommended community standards.
As you can see, adding this file will complete [Yoga's Community Profile](https://github.com/facebook/yoga/community)
checklist and increase the visibility of our COC.
We also added a link to the COC in the CONTRIBUTING doc because folks may miss the separate CODE_OF_CONDUCT document.
**test plan:**
Viewing it on my branch -


**issue:**
internal task t23481323
Closes https://github.com/facebook/yoga/pull/670
Reviewed By: emilsjolander
Differential Revision: D6384655
Pulled By: flarnie
fbshipit-source-id: 6c5557094719cc8f1b08deb4d477ab56603caf39
Summary: Use internal linting rules instead of the custom once.
Differential Revision: D6284667
fbshipit-source-id: 65aae336f1d7f14dfefed7391b0f5b89b333495e
Summary:
Before:
There was a broken link in ./docs/README.md
CONTRIBUTING didn't render markup on Github
After:
All links to CONTRIBUTING.md are not broken anymore
CONTRIBUTING.md renders markup on Github
Closes https://github.com/facebook/yoga/pull/458
Differential Revision: D4673746
Pulled By: emilsjolander
fbshipit-source-id: 151c1f38789a96b61dfbb544fd11996098dc456d