Hi,
Thanks for wanting to contribute to jamovi.
In order to contribute to the core jamovi code base (presently hosted at www.github.com/jamovi/jamovi), we require you to submit your contributions under a 'Contributor License Agreement', or CLA.
More information, including the motivations for a CLA, are detailed on the wikipedia page.
You can agree to the terms of the CLA through this google form. Note that this is the CLA for individuals -- if you wish to submit a CLA on behalf of an entity (i.e. a private company), please use this form.
Thanks.
- the jamovi team