Update README.md

Remove unused test files

Update project files

Update SFT train script

Add SFT package initialization

Add GRPO training script

Add GRPO training callbacks

Add GRPO trainer setup

Add GRPO reward functions

Add GRPO data loader

Add GRPO model loading utilities with LoRA support

Add GRPO configuration dataclass

Add grpo package initialization with professional structure

fix lora, layer, config sft

add sft stage use based model no unsloth