Add contact method to CODE_OF_CONDUCT.md

[jcbhmr]

awesome-typst/CODE_OF_CONDUCT.md

Lines 59 to 67 in 8ef7b64

	## Enforcement
	Instances of abusive, harassing, or otherwise unacceptable behavior may be
	reported to the community leaders responsible for enforcement at
	[INSERT CONTACT METHOD].
	All complaints will be reviewed and investigated promptly and fairly.
	All community leaders are obligated to respect the privacy and security of the
	reporter of any incident.

probably just forgot to fill out the template in github