!157 更新readme文档说明

From: @xyncoder 
Reviewed-by: @zhuchunyi 
Signed-off-by: @zhuchunyi

README.en.md

@@ -2,28 +2,37 @@
 
 #### Description
 
-`oemaker` is a building tool for making DVD iso, include standard iso, debug iso, source iso, everything iso, everything debug iso, everything source iso, edge computing iso and netinst iso.
-`oemaker` uses local arch when building, did not support cross building.
-currently, `oemaker` support the arch of aarch64 and x86_64 for iso making.
+The source package `oemaker` has two functions: iso making and iso cutting. Correspondingly, two binary RPM packages are generated: `oemaker` and `isocut`.
+
+The generated binary RPM package `oemaker` is a building tool for making DVD iso, include standard iso, debug iso, source iso, everything iso, everything source iso,everything debug iso, edge computing iso and netinst iso.
+
+The generated binary RPM package `isocut` is a building tool for iso cutting which supports only RPM package-level.
 
 #### Installation
 
-To install `oemaker`, you can use `rpm` or `dnf` package manager command with openEuler repository.
+To install `oemaker` and `isocut`, you can use `rpm` or `dnf` package manager command with openEuler repository.
 
-Install oemaker with dnf
+Install `oemaker` with dnf
 ```sh
 dnf install -y oemaker
 ```
 
+Install `isocut` with dnf
+```sh
+dnf install -y isocut
+```
+
 #### Instructions
 
-Generally, the disk space is more than 50g
+Generally, the disk space is more than 50g.
 
-#### Contribution
+#### Usage
+
+##### oemaker
 
 oemaker <font color=#0000FF >_[-h] [-t Type] [-p Product] [-v Version] [-r RELEASE] [-s REPOSITORY]_</font>
 
-    optional arguments:
+  optional arguments:
     -t Type
        ISO Type include standard debug source everything everything_debug everything_src and netinst
 
@@ -38,3 +47,21 @@ oemaker <font color=#0000FF >_[-h] [-t Type] [-p Product] [-v Version] [-r RELEA
 
     -s REPOSITORY
        source dnf repository address link(may be listed multiple times)
+
+    -h 
+       show the help message and exit
+
+##### isocut
+
+isocut <font color=#0000FF >_[-h] [-t temporary path] [-r extern rpm path] origin-iso dest-iso_</font>
+
+  positional arguments:
+
+    origin-iso    origin iso image
+    dest-iso      destination iso image
+
+  optional arguments:
+
+    -t    the temporary path which must be an absolute path and must be greater than 8g
+    -r    extern rpm packages path
+    -h    show the help message and exit

README.md

@@ -1,19 +1,27 @@
 # oemaker
 
 #### 介绍
-oemaker是一款用于构建DVD iso的工具，包括标准iso，debug iso, source iso, everything iso, everything debug iso, everything source iso, edge computing iso and netinst iso等。
-oemaker采用的是本地架构的方式进行构建，不支持交叉编译环境构建。
-目前，oemkaer支持aarch64和x86_64两个架构的iso制作。
+
+源码包oemaker保护两部分功能：iso制作和iso裁剪。相应的，会构建生成两个二进制RPM包：oemaker和isocut.
+
+生成的二进制RPM包oemaker是一款用于构建DVD iso的工具，包括标准iso，debug iso, source iso, everything iso, everything debug iso, everything source, edge computing iso and netinst iso等
+
+生成的二进制RPM包isocut是一款用于iso裁剪的构建工具，支持RPM包级别的裁剪。
 
 #### 安装教程
 
-可以用rpm命令或dnf包管理命令通过openEuler repository安装oemaker包。
+可以用`rpm`或`dnf`命令通过openEuler repository来安装`oemaker`和`isocut`包。
 
-用dnf命令安装方式：
+用dnf命令安装`oemaker`方式：
 ```sh
 dnf install -y oemaker
 ```
 
+用dnf命令安装`isocut`方式：
+```sh
+dnf install -y isocut
+```
+
 #### 使用说明
 
 一般要求磁盘空间大于50G
@@ -21,6 +29,8 @@ dnf install -y oemaker
 
 #### 使用方法
 
+##### oemaker
+
 oemaker <font color=#0000FF >_[-h] [-t Type] [-p Product] [-v Version] [-r RELEASE] [-s REPOSITORY]_</font>
 
     optional arguments:
@@ -41,3 +51,18 @@ oemaker <font color=#0000FF >_[-h] [-t Type] [-p Product] [-v Version] [-r RELEA
 
     -h 
        show the help message and exit
+
+##### isocut
+
+isocut <font color=#0000FF >_[-h] [-t temporary path] [-r extern rpm path] origin-iso dest-iso_</font>
+
+  positional arguments:
+
+    origin-iso    origin iso image
+    dest-iso      destination iso image
+
+  optional arguments:
+
+    -t    the temporary path which must be an absolute path and must be greater than 8g
+    -r    extern rpm packages path
+    -h    show the help message and exit