[Modules] Code of Conduct for Modules

[Xavier D. <xav...@gm...>]

Hello All,

Following good practices, a Code of Conduct has been set for the
project and all its community spaces (web site, github/sourceforge
project, mailing-list, twitter account, documentation portal, etc):

https://github.com/cea-hpc/modules/blob/main/CODE_OF_CONDUCT.md

It is based on the widely adopted Contributor Covenant.

Regards,
Xavier