Documentation: Add code of conduct

Communities have standards regarding behaviours they consider acceptable
or not acceptable, and expect community members to follow those
standards. libcamera is no different, even if it has never clearly
expressed those standards in a formal code of conduct document.

Like software licenses, codes of conduct can be written in a myriad of
ways. And like software licenses, using a widely adopted code of conduct
instead of writing our own can help bringing clarity. One such standard
code of conduct is the Contributor Covenant, stewarded by the
Organization for Ethical Source.

The Contributor Covenant has been adopted by the freedesktop.org
organization, which hosts a large number of projects historically
related to graphics, and more recently to multimedia in general.
freedesktop.org offers services such as git hosting with CI, which
libcamera could benefit from. There is therefore a clear incentive to
choose the same code of conduct as freedesktop.org, and no known
drawback.

As a first step towards this, and to keep the libcamera code of conduct
history clear in git, copy the original Contributor Covenant v1.4 from
https://github.com/EthicalSource/contributor_covenant/. "v1.4" is
ambiguous as the document initially published as v1.4 has received small
(but sometimes significant) modifications over time. The version
imported here ([1]) is the most recent "v1.4", from tags/2.1 (commit
8a3be1350b07 "Merge pull request #979 from JustArchi/patch-2").

[1] https://github.com/EthicalSource/contributor_covenant/blob/2.1/content/version/1/4/code-of-conduct.md

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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