Add free courses offered by Redis to awesome-certificates

[waleedsadek-panx]

This issue proposes to add the free certifications from Redis University to the awesome-certificates repository:

Steps to complete:

• First: fork this project, then edit awesome-certificates/readme.md file to include the free course/certificates.
• Second: open a pull request, if you're new to pull requests read about it here.
• Third: read and adhere to the list guidelines.

Once your pull request is submitted, it will be reviewed by a maintainer of the awesome-certificates repository. If your changes are approved, they will be merged into the main branch of the repository.

Thank you for your contribution to the awesome-certificates repository!