docs: update README.md

Author: wxsms

README.md

@@ -52,6 +52,21 @@ For more information, pls visit [https://uiv.wxsm.space/usage/getting-started.ht
 
 Detailed changes for each release are documented in the [release notes](https://github.com/uiv-lib/uiv/releases).
 
+## Funding
+
+If you think that this project is useful and wanted to support it financially, feel free to choose payment methods below. I really appreciate it.
+
+如果你觉得该项目有用，并且想要对它进行一些经济上的资助，请在下面选择一个付款方式。感谢！
+
+### Paypal
+
+[https://www.paypal.com/paypalme/wxsm](https://www.paypal.com/paypalme/wxsm)
+
+### 支付宝 Alipay & 微信支付 Wechat pay
+
+<img width="200" src="https://user-images.githubusercontent.com/5960988/95557842-f556e300-0a47-11eb-99e8-4378cc058176.png" alt="alipay.png">
+<img width="200" src="https://user-images.githubusercontent.com/5960988/95557874-00117800-0a48-11eb-9276-96f89c037762.png" alt="wxpay.png">
+
 ## License
 
 MIT