fix: update README installation steps

README-CN.md

@@ -69,7 +69,7 @@ Cloudpods提供了如下的功能：
 
 ## 快速开始
 
-我们可以通过以下简单两步将Cloudpods安装在一台至少8GiB内存和100GB硬盘的Linux主机上（目前CentOS 7和Debian 10经过充分测试）
+我们可以通过以下简单三步将Cloudpods安装在一台至少8GiB内存和100GB硬盘的Linux主机上（目前CentOS 7和Debian 10经过充分测试）
 
 (下面假设该主机的IP为 *10.168.26.216*)
 
@@ -87,7 +87,19 @@ $ ssh-copy-id -i ~/.ssh/id_rsa.pub root@10.168.26.216
 $ ssh root@10.168.26.216 "hostname"
 ```
 
-### 2. 安装Cloudpods
+### 2. 安装git和相关工具
+
+#### CentOS 7安装git和epel源
+```bash
+yum install -y git epel-release
+```
+
+#### Debian 10安装git
+```bash
+apt install -y git
+```
+
+### 3. 安装Cloudpods
 
 通过以下命令开始安装Cloudpods：
 

README.md

@@ -69,7 +69,7 @@ Cloudpods is a cloud-native open source unified multi/hybrid-cloud platform deve
 
 ## Quick start
 
-You may install Cloudpods in a Linux box (currently CentOS 7 and Debian 10 are fully tested) with at least 8GiB RAM and 100GB storage by following two steps.
+You may install Cloudpods in a Linux box (currently CentOS 7 and Debian 10 are fully tested) with at least 8GiB RAM and 100GB storage by following three steps.
 
 (Assuming that you install Cloudpods on a Linux box with IP *10.168.26.216*):
 
@@ -90,7 +90,19 @@ $ ssh-copy-id -i ~/.ssh/id_rsa.pub root@10.168.26.216
 $ ssh root@10.168.26.216 "hostname"
 ```
 
-### 2. Install Cloudpods
+### 2. Install git and relevant tools
+
+#### For CentOS 7
+```bash
+yum install -y git epel-release
+```
+
+#### For Debian 10
+```bash
+apt install -y git
+```
+
+### 3. Install Cloudpods
 
 Run the following commands to start installing Cloudpods.