Please visit the following link in order to read the Contribution Guidelines.
Before contributing to the project, all contributors must sign a Developer Certificate of Origin (DCO). By signing the DCO, you are attesting that you are the author of the contribution and you are freely contributing it under the terms of the Apache-2.0 license.
To sign the DCO, include a copy of the Developer’s Certificate of Origin 1.1 in a pull request comment.