Add a stargazers over time chart

README-zh.md

@@ -58,3 +58,7 @@ sudo mv jcli /usr/local/bin/
 # 贡献
 
 如果你对该项目感兴趣，请首先仔细阅读我们的[贡献指南](CONTRIBUTING.md)。我们欢迎任何形式的贡献。
+
+# 点赞数趋势图
+
+[![Stargazers over time](https://starchart.cc/jenkins-zh/jenkins-cli.svg)](https://starchart.cc/jenkins-zh/jenkins-cli)

README.md

@@ -60,3 +60,7 @@ Read [this document](doc/README.md) to know more details about how to use `jcli`
 
 If you're interested in this project. Please go through the
 [contribution guide](CONTRIBUTING.md). Any contributions are welcome.
+
+# Stargazers over time
+
+[![Stargazers over time](https://starchart.cc/jenkins-zh/jenkins-cli.svg)](https://starchart.cc/jenkins-zh/jenkins-cli)
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