Any code you submit in csprite organization will become part of the repository and be distributed under the license that repository follows. By submitting code you agree that the code is your work and that you give all the rights of it to the csprite organization.
You also agree by submitting your code that you grant all transferrable rights to the code to the project maintainer, including for example re-licensing the code, modifying the code, and distributing it in source or binary forms. Specifically, this includes a requirement that you assign copyright to the project maintainer. For this reason, do not modify any copyright statements in files in any PRs.