doc: rename CONTRIBUTION.md and add github start chart

CONTRIBUTION.md

@@ -1,4 +1,4 @@
-# Lancet Contributing Guide
+# Lancet Contribution Guide
 
 Hi! Thank you for choosing Lancet.
 

README.md

@@ -2052,11 +2052,15 @@ import "github.com/duke-git/lancet/v2/xerror"
 
 ## How to Contribute
 
-#### [Contributing Guide](./CONTRIBUTING.md)
+#### [Contribution Guide](./CONTRIBUTION.md)
 
 ## Contributors
 Thank you to all the people who contributed to lancet!
 
 <a href="https://github.com/duke-git/lancet/graphs/contributors">
   <img src="https://contrib.rocks/image?repo=duke-git/lancet" />
-</a>
+</a>
+
+## Star History
+
+[![Star History Chart](https://api.star-history.com/svg?repos=duke-git/lancet&type=Date)](https://star-history.com/#duke-git/lancet&Date)

README_zh-CN.md

@@ -2057,7 +2057,7 @@ import "github.com/duke-git/lancet/v2/xerror"
 
 ## 如何贡献代码
 
-#### [贡献代码指南](./CONTRIBUTING.zh-CN.md)
+#### [代码贡献指南](./CONTRIBUTION.zh-CN.md)
 
 ## 贡献者
 
@@ -2066,3 +2066,7 @@ import "github.com/duke-git/lancet/v2/xerror"
 <a href="https://github.com/duke-git/lancet/graphs/contributors">
   <img src="https://contrib.rocks/image?repo=duke-git/lancet" />
 </a>
+
+## GitHub Stars
+
+[![Star History Chart](https://api.star-history.com/svg?repos=duke-git/lancet&type=Date)](https://star-history.com/#duke-git/lancet&Date)