docs: update contributing align with go-sdk (#820)

Signed-off-by: leoff00 <leof0180@gmail.com>
Signed-off-by: Todd Baert <todd.baert@dynatrace.com>
Co-authored-by: Todd Baert <todd.baert@dynatrace.com>
Co-authored-by: Roman Dmytrenko <rdmytrenko@gmail.com>

Author: 3 people

CONTRIBUTING.md

@@ -67,6 +67,20 @@ You can run all tests, including e2e tests using the command:
 make e2e
 ```
 
+## Developer Certificate of Origin
+Developer Certificate of Origin
+The Developer Certificate of Origin (DCO) is a lightweight way for contributors to certify that they wrote or otherwise have the right to submit the code they are contributing to the project. To sign off that they adhere to these requirements, all commits need to have a Signed-off-by line, like:
+
+```
+fix: solve all the problems
+
+Signed-off-by: John Doe <jd@example.org>
+```
+
+This is easy to add by using the -s/--signoff flag to git commit.
+
+More info is available in the OpenFeature [community docs](https://openfeature.dev/community/technical-guidelines/#developer-certificate-of-origin).
+
 ## Releases
 
 This repo uses _Release Please_ to release packages. Release Please sets up a running PR that tracks all changes for the library components, and maintains the versions according to [conventional commits](https://www.conventionalcommits.org/en/v1.0.0/), generated when [PRs are merged](https://github.com/amannn/action-semantic-pull-request).