Prepare CohortContrast for CRAN Submission

[haugmarkus]

We should prepare the CohortContrast package for submission to CRAN. This process includes ensuring all package requirements are met, performing automated testing, and managing dependencies effectively; we can draw a roadmap for it.

Key Tasks:

• Automated Testing: Implement and verify automated tests to ensure the package works consistently across different platforms

• Dependency Management: Ensure all package dependencies are correctly specified and managed to prevent issues during installation and use.

• Documentation: Review and update package documentation and vignettes to meet CRAN standards.

CRAN Submission: Prepare and submit the package according to CRAN guidelines.

Tagging @catalamarti for his expertise in getting OMOP-based packages onto CRAN. What do you think, what would be the first steps?