docs: update README

Author: ChenZiHong-Gavin

README.md

@@ -1 +1,21 @@
-# GraphGen
+# GraphGen: Knowledge-Driven Synthetic Data Generation for Enhancing LLM Supervised Fine-Tuning
+
+```text
+├── baselines/           # baseline methods
+├── cache/               # cache files
+│   ├── data/            # generated data
+│   ├── logs/            # log files
+├── configs/             # configuration files
+├── graphgen/            # GraphGen implementation
+│   ├── operators/       # operators
+│   ├── graphgen.py      # main file
+├── models/              # base classes
+├── resources/           # static files and examples
+├── scripts/             # scripts for running experiments
+├── templates/           # prompt templates
+├── utils/               # utility functions
+├── webui/               # web interface
+└── README.md
+```
+
+GraphGen is a framework for synthetic data generation guided by knowledge graphs.