Add concise TL;DR usage summary and Quick Start download steps to README

[Copilot]

The issue asked for a concise, easy-to-follow explanation so newcomers can quickly understand how to use the project. This update adds a short, scannable quick-usage summary at the top of the documentation and expands the Quick start section with explicit repository download steps.

• Documentation clarity
  • Add a TL;DR section with the minimal steps to configure and run DRGS-Net.
  • Point readers to the "Quick start" section for full dependency setup.
  • Add repo download and cd steps so users can start from a fresh clone.

Example snippet:

## TL;DR (Quick usage)
1) Install dependencies (see "Quick start" below for full setup commands).
2) Copy the default config: `cp DRGS-Net.yaml config_concatenate.yaml`
3) Edit `config_concatenate.yaml` with your dataset paths and ChemBERTa checkpoint.
4) Run: `python DRGS-Net_finetune.py`

Original prompt

다른 사람들이 이용하기 편하게 설명글을 간단명료하게 작성해줘

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[thkim-01]

@copilot Quick Start 부분도 넣어서 내 저장소를 사용자가 다운로드 받은뒤 모델을 실행할 수 있게하기위한 가이드라인도 적어줘

[Copilot]

@copilot Quick Start 부분도 넣어서 내 저장소를 사용자가 다운로드 받은뒤 모델을 실행할 수 있게하기위한 가이드라인도 적어줘

Quick start에 저장소 다운로드/이동 단계 추가했습니다. 반영 커밋: 281fbf6.