Add suggestion on projects to fork (for complete beginners)

It would be nice to add suggested projects to fork and build a CI/CD pipeline for, based on the difficulty of the task.

https://github.com/bregman-arie/devops-exercises/blob/master/exercises/devops/ci_for_open_source_project.md

Thnaks for your feedback.

Start with exercises/devops/ci_for_open_source_project.md, the only file linked in the issue, and review how its difficulty is described. Then identify the repository's conventions for exercise content and determine the scope of suggested forkable projects and CI/CD examples. Done means the requested beginner-oriented suggestions are documented with difficulty guidance.

Written by the indexing model from the issue text.