docs: update README

Author: ChenZiHong-Gavin

README.md

@@ -79,7 +79,7 @@ For any questions, please check [FAQ](https://github.com/open-sciencelab/GraphGe
 2. Clone the repository
 
     ```bash
-    git clone https://github.com/open-sciencelab/GraphGen
+    git clone --depth=1 https://github.com/open-sciencelab/GraphGen
     cd GraphGen
     ```
 

README_ZH.md

@@ -80,7 +80,7 @@ GraphGen 首先根据源文本构建细粒度的知识图谱，然后利用期
 2. 克隆仓库
 
     ```bash
-    git clone https://github.com/open-sciencelab/GraphGen
+    git clone --depth=1 https://github.com/open-sciencelab/GraphGen
     cd GraphGen
     ```
 3. 创建新的 uv 环境