jugit.fz-juelich.de/mlz/libcerf

[and-ri]

closes #602

[what-the-diff]

PR Summary

• Introduction of a new package.yml file
  A new file named package.yml has been added in the project projects/jugit.fz-juelich.de/mlz/libcerf. This new file carries important information such as the URL from where the project can be accessed, a display name for the project, the existing GitLab version, dependencies required for building and testing the project, the build script, and the script for testing.

• Addition of a test code in test.c file
  Another novel file test.c has been added to the project projects/jugit.fz-juelich.de/mlz/libcerf. This file contains a specific piece of code designed to test the functioning of the cerf function in the software.