Add DCO requirement in Contributing guidelines (#4008)

Signed-off-by: Olivier Lemasle <o.lemasle@gmail.com>
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Olivier Lemasle 2020-07-14 18:38:57 +02:00 committed by GitHub
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@ -76,6 +76,17 @@ $ go mod tidy
Please refer to [Go Modules](https://github.com/golang/go/wiki/Modules) for more details.
## Developer Certificate of Origin
As required by the CNCF's [charter](https://github.com/cncf/foundation/blob/master/charter.md#11-ip-policy),
all new code contributions must be accompanied by a [Developer Certificate of Origin (DCO)](https://developercertificate.org/). CoreDNS uses [Probot](https://github.com/probot/dco#how-it-works) to enforce the DCO on pull requests.
You may use git option `-s` to append automatically to the `Sign-off-by` line to your commit messages:
```
$ git commit -s -m 'This is my commit message'
```
# Thank You
Thanks for your help! CoreDNS would not be what it is today without your contributions.