feat: add sponsorship ❤️

Author: reuixiy

.github/FUNDING.yml

@@ -0,0 +1 @@
+github: reuixiy

README.md

@@ -178,3 +178,13 @@ See [#2](https://github.com/reuixiy/hugo-theme-meme/issues/2).
   \*: see https://gohugo.io/content-management/front-matter/
       and https://gohugo.io/templates/internal/#configure-disqus
 </details>
+
+## Sponsorship
+
+We are grateful to the following sponsors for their support:
+
+[![GitHub Sponsors](https://img.shields.io/github/sponsors/reuixiy?style=social)](https://github.com/sponsors/reuixiy)
+
+[![Powered by DartNode](https://dartnode.com/branding/DN-Open-Source-sm.png)](https://dartnode.com?aff=QuirkyKoala717 "Powered by DartNode - Free VPS for Open Source")
+
+*: _Some of these links are affiliate links, which means that if you click on one of the product links, I’ll receive a small commission. This helps support me to spend more time developing MemE. Thank you for the support!_

README.zh-cn.md

@@ -111,3 +111,7 @@ MemE 通过 Hugo 管道实现使用 SCSS 生成 CSS，而非静态的 CSS 文件
 ## 支持的 Front Matter
 
 请看 <https://github.com/reuixiy/hugo-theme-meme#supported-front-matter>。
+
+## 赞助
+
+请看 <https://github.com/reuixiy/hugo-theme-meme#sponsorship>。

README.zh-tw.md

@@ -111,3 +111,7 @@ MemE 透過 Hugo 管道實現使用 SCSS 生成 CSS，而非靜態的 CSS 檔案
 ## 支援的 Front Matter
 
 請看 <https://github.com/reuixiy/hugo-theme-meme#supported-front-matter>。
+
+## 讚助
+
+請看 <https://github.com/reuixiy/hugo-theme-meme#sponsorship>。