docs: add CODE_OF_CONDUCT

[manekinekko]

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[nx-cloud]

Nx Cloud Report

CI ran the following commands for commit 6df334a. Click to see the status, the terminal output, and the build insights.

Status	Command	Start Time
	nx affected:build --base=origin/main --head=HEAD --parallel --with-deps	10/19/2020, 8:25:33 AM
	nx affected:e2e --base=origin/main --head=HEAD --parallel --with-deps	10/19/2020, 8:23:15 AM
	nx affected:lint --base=origin/main --head=HEAD --parallel	10/19/2020, 8:23:19 AM
	nx affected:test --base=origin/main --head=HEAD --parallel --with-deps	10/19/2020, 8:23:22 AM

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