PEPS needs contributors, so thanks for considering contributing.
Note that there are two repositories: This one with the distribution definition and configuration (Docker containers) and the application source. The reason is that you don't need to clone the source when deploying servers.
To get started, sign the Contributor License Agreement. The CLA is directly adapted from the Apache Foundation CLA and does not require you to assign copyright of your contributions.
Then, fork the repository and submit pull requests. They will be reviewed before merging.
Please read the corresponding wiki page.
Thank you!