Add Mockium to Generators / Frontend Development

[cyr1l0u]

Pull Request

Description

Add Mockium, an online data generator for testing and prototyping, to Generators / Frontend Development

Closes #

Type of change

• [x] Adding a new Resource
• [ ] Adding a new Category
• [ ] Documentation enhancement or fixes
• [ ] Website enhancement or fixes

Checklist:

• [x] I read carefully CONTRIBUTING.md
• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation

Screenshots (if appropriate):

Please add screenshots to help explain your changes.

Additional