In Bread, a project can be anything with a Git repository.
Add a .bread.yml file to the top level of your repository to let Bread know how to handle received donations. Any repository with a .bread.yml will be recognized as a project; you don't need to create an account to do this.
Bread identifies projects by the http Git URL, like https://github.com/andrewbaxter/bread.
You can also create a donate button to make it easier for people to donate to your project.