At its current stage in development, Pore's contribution guidelines are fairly loose, though this is subject to change as development progresses. Currently, the only criteria are that contributions compile, and that they adhere to Pore's goals as a project:
Porekitsubmodule unless absolutely necessary.
Once you've ensured that your contribution meets the above requirements, you may submit them as a pull request to the main repository. The pull request must include information regarding what has been changed and what is accomplished in as much detail as possible without redundancy.