chore: add sponsor badge.

.github/FUNDING.yml

@@ -0,0 +1,9 @@
+# These are supported funding model platforms
+
+# github: [jaywcjlove]
+# patreon: # Replace with a single Patreon username
+# open_collective: # Replace with a single Open Collective username
+# ko_fi: # Replace with a single Ko-fi username
+# tidelift: #npm/mocker-api
+# community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+custom: https://jaywcjlove.github.io/#/sponsor

README.md

@@ -2,6 +2,7 @@ rehype-rewrite
 ===
 <!--rehype:style=display: flex; height: 230px; align-items: center; justify-content: center; font-size: 38px;-->
 
+[![Buy me a coffee](https://img.shields.io/badge/Buy%20me%20a%20coffee-048754?logo=buymeacoffee)](https://jaywcjlove.github.io/#/sponsor)
 [![Downloads](https://img.shields.io/npm/dm/rehype-rewrite.svg?style=flat)](https://www.npmjs.com/package/rehype-rewrite)
 [![NPM version](https://img.shields.io/npm/v/rehype-rewrite.svg?style=flat)](https://npmjs.org/package/rehype-rewrite)
 [![Build](https://github.com/jaywcjlove/rehype-rewrite/actions/workflows/ci.yml/badge.svg)](https://github.com/jaywcjlove/rehype-rewrite/actions/workflows/ci.yml)