CHEF-26046 - Replace CODE_OF_CONDUCT.md file

[cgunasree08]

As part of the repo standardization effort we are standardizing all repos to have a standard CODE_OF_CONDUCT.md file that points to the main Chef Code of Conduct. This is not intended to be a change in policy, but rather an administrative change.

[sonarqube-for-infrastructure-prod[bot]]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarQube

[jasonheath]

@habitat-sh/repo-standardizers, please review and merge at your convenience