Update README.md

添加简介

Author: wj882018

README.md

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 ## Introduction
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+**High Accuracy and efficiency multi-task fine-tuning framework for Code LLMs.**
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 **CodeFuse-MFTCoder** is an open-source project of CodeFuse for multitasking Code-LLMs(large language model for code tasks), which includes models, datasets, training codebases and inference guides.
 In MFTCoder, we released two codebases for finetuning Large Language Models: 
 - ```mft_peft_hf``` is based on the HuggingFace Accelerate and deepspeed framework.