Add a Chinese version of readme file

README-zh.md

+# jcli-ishell-plugin
+这是 [Jenkins CLI](https://github.com/jenkins-zh/jenkins-cli/) 的一个插件，它可以让你以交互式命令的方式管理你的 Jenkins 任务。
+
+# 快速开始
+```
+jcli config plugin fetch
+jcli config plugin install ishell
+➜  ~ jcli ishell
+interactive Jenkins job shell
+>>> help
+
+Commands:
+  build        trigger current job
+  clear        clear the screen
+  context      switch context between different Jenkins
+  current      show the current Jenkins
+  exit         exit the program
+  help         display help
+  history      show the history of job builds
+  job          set or print current job name
+  search       search all jobs
+  version      show the version of this plugin
+
+
+>>>
+```
+
+# 更多插件
+你可以从[这里](https://github.com/jenkins-zh/jcli-plugins)找到更多的插件。