Added a link to the sponsoring page.

README.md

@@ -114,6 +114,10 @@ Refer to https://pkg.go.dev/github.com/rivo/tview for the package's documentatio
 
 This package is based on [github.com/gdamore/tcell](https://github.com/gdamore/tcell) (and its dependencies) as well as on [github.com/rivo/uniseg](https://github.com/rivo/uniseg).
 
+## Sponsor this Project
+
+[Become a Sponsor on GitHub](https://github.com/sponsors/rivo?metadata_source=tview_readme) to further this project!
+
 ## Versioning and Backwards-Compatibility
 
 I try really hard to keep this project backwards compatible. Your software should not break when you upgrade `tview`. But this also means that some of its shortcomings that were present in the initial versions will remain. In addition, at least for the time being, you won't find any version tags in this repo. The newest version should be the one to upgrade to. It has all the bugfixes and latest features. Having said that, backwards compatibility may still break when: