doc: update readme

README_en.md

@@ -8,6 +8,10 @@ The project uses the Chinese national standard cryptography algorithm to impleme
 
 ## Environment Dependencies
 
+System requirements:  
+- Linux
+- Windows
+
 The project relies on the following software:  
 - Python 3.11
 - gmssl
@@ -15,6 +19,21 @@ The project relies on the following software:
 
 ## Installation Steps
 
+### Pre-installation
+This project depends on gmssl, so you need to compile it from source first.  
+Visit [GmSSL](https://github.com/guanzhi/GmSSL) to learn how to install.  
+
 ```bash
-pip install
+pip install -r requirements.txt -i https://pypi.tuna.tsinghua.edu.cn/simple
 ```
+
+## Usage Instructions
+
+
+## References  
+[TPRE Algorithm Blog Post](https://www.cnblogs.com/pam-sh/p/17364656.html#tprelib%E7%AE%97%E6%B3%95)
+[Gmssl-python library](https://github.com/GmSSL/GmSSL-Python)
+
+
+## License
+GNU GENERAL PUBLIC LICENSE v3