Adding the most popular interview question: implementing lora from sc…

[yjianpen]

This pr will add a problem related to lora update. I think it's really helpful for interview preparation

[moe18]

would you be able to put it in the new problem format?

.
├─ questions/
│ ├─ _template/ ← Copy this to start a new problem
│ ├─ 101_grpo_objective/
│ │ ├─ meta.json
│ │ ├─ description.md
│ │ ├─ learn.md
│ │ ├─ starter_code.py
│ │ ├─ solution.py
│ │ ├─ example.json
│ │ ├─ tests.json
│ │ ├─ tinygrad/
│ │ │ ├─ starter_code.py
│ │ │ ├─ solution.py
│ │ │ └─ tests.json
│ │ └─ pytorch/
│ │ ├─ starter_code.py
│ │ ├─ solution.py
│ │ └─ tests.json
│ └─ ...
│
├─ schemas/
│ └─ question.schema.json ← JSON-Schema used for validation
│
├─ utils/
│ ├─ build_bundle.py ← folder → build/*.json bundler
│ ├─ validate_questions.py ← schema validator
│ └─ make_question_template.py← template folder generator
│
└─ .github/workflows/
└─ format_questions.yml ← GitHub Action: validate on PR/push

[moe18]

checkout this one for reference
https://github.com/Open-Deep-ML/DML-OpenProblem/tree/main/questions/101_implement-the-grpo-objective-function