docs: add toolset build dependency (#19956)

README-CN.md

@@ -104,6 +104,16 @@ sudo yum install -y zlib-devel zlib-static xz-devel snappy-devel jansson jansson
 sudo yum config-manager --set-enabled Powertools
 ```
 
+#### CentOS + devtoolset
+
+除上述编译依赖包，需要执行以下命令：
+
+```
+sudo yum install centos-release-scl
+sudo yum install devtoolset-9 devtoolset-9-libatomic-devel
+scl enable devtoolset-9 -- bash
+```
+
 ### macOS
 
 ```

README.md

@@ -111,6 +111,16 @@ If the PowerTools installation fails, you can try to use:
 sudo yum config-manager --set-enabled powertools
 ```
 
+#### For CentOS + devtoolset
+
+Besides above dependencies, please run following commands:
+
+```
+sudo yum install centos-release-scl
+sudo yum install devtoolset-9 devtoolset-9-libatomic-devel
+scl enable devtoolset-9 -- bash
+```
+
 ### macOS
 
 ```