Update README

Author: pschiffe

Diff for: .github/FUNDING.yml

@@ -0,0 +1,2 @@
+github: pschiffe
+custom: "https://www.paypal.com/paypalme/pschiffe"

Diff for: README.md

@@ -8,6 +8,13 @@ https://hub.docker.com/r/pschiffe/burp-client/
 
 https://hub.docker.com/r/pschiffe/burp-ui/
 
+Source GitHub repository: https://github.com/pschiffe/docker-burp
+
+---
+[![Static Badge](https://img.shields.io/badge/GitHub_Sponsors-grey?logo=github)](https://github.com/sponsors/pschiffe) [![Static Badge](https://img.shields.io/badge/paypal.me-grey?logo=paypal)](https://www.paypal.com/paypalme/pschiffe)
+
+If this project is useful to you, please consider sponsoring me to support maintenance and further development. Thank you!
+
 ## Burp Server
 
 ![Docker Image Size (tag)](https://img.shields.io/docker/image-size/pschiffe/burp-server/latest) ![Docker Pulls](https://img.shields.io/docker/pulls/pschiffe/burp-server)