code: public GitlabProject createProjectForGroup(String name, GitlabGroup group, String description, String visibility) throws IOException {
          return createProject(name, group.getId(), description, null, null, null, null, null, null, visibility, null);
      }
docs: Creates a group Project
  
  @param name        The name of the project
  @param group       The group for which the project should be crated
  @param description The project description
  @param visibility  The project visibility level (private: 0, internal: 10, public: 20)
  @return The GitLab Project
  @throws IOException on gitlab api call error