docs: add the donate

README.md

@@ -187,6 +187,12 @@ custom time-picker
 [CHANGELOG](CHANGELOG.md)
 
 
+## Donate
+
+If you find this project useful, you can buy author a glass of juice
+
+[Paypal Me](https://www.paypal.me/mengxiong10)
+
 ## License
 
 [MIT](https://github.com/mengxiong10/vue2-datepicker/blob/master/LICENSE)

README.zh-CN.md

@@ -185,6 +185,12 @@ export default {
 
 [CHANGELOG](CHANGELOG.md)
 
+## 捐赠
+
+如果这个项目帮到了你, 你可以请作者喝杯果汁
+
+[Paypal Me](https://www.paypal.me/mengxiong10)
+
 
 ## 许可证