Create CODE_OF_CONDUCT.md

[pedrocruzio]

[what-the-diff[bot]]

• A new file was created
• The code of conduct is now in the .github folder instead of root directory
• There are 128 lines in this document, which includes a pledge and standards for community members to follow as well as enforcement responsibilities and guidelines

[jonchang]

Looks like this pull request is against the wrong repository? Should be this one: https://github.com/teaxyz/.github

[mxcl]

Please reopen there @pedrocruzio