The two ways to contribute to MIMPowerShellConnectors Repo are: Fork the Repository or Submit an Issue.
Fork a copy of the MIMPowerShellConnectors Repo, make the changes in your fork and send a pull request. Forking a repository allows you to freely experiment with changes without affecting the original project. See Fork A Repo help article for more information.
When developing the code, make sure that you instrument your code extensively and that the code runs with minimum privileges and memory foot-print. Do not hard-code any values, but instead make them configurable via the FIM Sync Engine UI.
While code acceptance for a bug fix or a minor enhancement is likely to be very straightforward, the code for a new connector will be accepted only if there is consensus among ALL project admins. If there is already a PowerShell connector for similar functionality, you may be asked to join forces and merge your connector with the one that already exists.
You can also submit an issue. Use the Issues tab to create a new issue.