Green's Open Problems #67

### What is the conjecture
https://people.maths.ox.ac.uk/greenbj/papers/open-problems.pdf#problem.67

Bounds for Waring’s problem over finite fields.

### [AMS categories](https://github.com/google-deepmind/formal-conjectures/labels?q=ams-)

* ams-11

### Choose either option
- [ ] I plan on adding this conjecture to the repository
- [x] This issue is up for grabs: I would like to see this conjecture added by somebody else

Start by reading Problem 67 in the linked open-problems PDF, then inspect the repository's existing formalized conjectures for conventions. The work is done when the bounds for Waring’s problem over finite fields are added as a formal conjecture in the repository.

Written by the indexing model from the issue text.