Feature/registration

[MaxWasUnavailable]

Description

Set up registration route on the backend, with throttling.

Type of change

Please delete options that are not relevant.

• [x] New feature (non-breaking change which adds functionality)
• [x] This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce.

• Tested routes using postman.

Checklist:

Please check [x] all that apply.

• [x] My code follows similar styling to existing code in this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, at the very least in hard-to-understand areas
• [ ] I have made corresponding changes to documentation / READMEs
• [x] My changes generate no new warnings
• [ ] I have remade my frontend and backend Docker containers to ensure my changes do not break the setup for these
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [x] I have checked my code and corrected any misspellings