Add Ko-fi support: FUNDING.yml + README badge and link

Author: Dennis Braun

.github/FUNDING.yml

@@ -0,0 +1 @@
+ko_fi: itsdnns

README.md

@@ -8,6 +8,7 @@
   <a href="LICENSE"><img src="https://img.shields.io/github/license/itsDNNS/docsight" alt="License"></a>
   <a href="https://github.com/itsDNNS/docsight/pkgs/container/docsight"><img src="https://img.shields.io/github/v/tag/itsDNNS/docsight?label=version" alt="Version"></a>
   <a href="https://github.com/itsDNNS/docsight/stargazers"><img src="https://img.shields.io/github/stars/itsDNNS/docsight?style=flat" alt="Stars"></a>
+  <a href="https://ko-fi.com/itsdnns"><img src="https://img.shields.io/badge/Ko--fi-Support%20DOCSight-ff5e5b?logo=ko-fi&logoColor=white" alt="Ko-fi"></a>
 </p>
 
 <p align="center">
@@ -119,6 +120,10 @@ See the **[full roadmap](https://github.com/itsDNNS/docsight/wiki/Roadmap)** in
 
 See [GitHub Releases](https://github.com/itsDNNS/docsight/releases).
 
+## Support
+
+If DOCSight helps you, consider [buying me a coffee](https://ko-fi.com/itsdnns) ☕
+
 ## License
 
 [MIT](LICENSE)