修改： README.md

README.md

-# CSST-COMMOM-CRMASK
+# CSST-COMMOM-CRMASK - Introduction
 
-detect cosmic rays and mask them 
+**CRMask** is a module for detecting cosmic rays on the CSST images using state-of-art models. It should be also applied for images from other telescopes, as long as the images have the same data structure as that of CSST.
 
-# 软件依赖
+# Python package dependencies
 
-依赖的python包numpy, scipy, matplotlib, astropy, ccdproc, pytorch, deepCR
+The following python packages are needed to **CRMask**:
 
-Ubuntu 20.04系统下安装方法
+* astropy == 4.x (>= 5.0 will be tested in the future) 
+* ccdproc >= 2.1.0
+* deepCR >= 0.1.5
+* matplotlib >= 3.1.2
+* numpy >= 1.19.5
+* pytorch >= 1.8.1
+* scipy >= 1.3.3
 
-sudo apt install python3-numpy python3-scipy python3-matplotlib python3-astropy python3-ccdproc
+Install these package under Ubuntu 20.04 LTS:
 
-python3 -m pip install pytorch deepCR
+        sudo apt install python3-numpy python3-scipy python3-matplotlib python3-astropy python3-ccdproc
+        python3 -m pip install pytorch deepCR
 
-# 使用方法
+# Use guide
 
 下载crmask.py，crmask.ini这两个文件。