README.md: added sponsorship button for all contributors

Since we want equal competition and ensures all contributors are fully
facilitated with financial source, we should add the sponsorship button
in. Hence, let's do this.

This patch adds sponsorship button for all contributors in README.md.

Co-authored-by: Shuralyov, Jean <jean.shuralyov@proton.me>
Co-authored-by: Galyna, Cory <124406765+corygalyna@users.noreply.github.com>
Signed-off-by: (Holloway) Chew, Kean Ho <hollowaykeanho@gmail.com>

README.md

@@ -24,10 +24,10 @@ For these reasons:
 ### Contributors
 This repository was made possible by the following contributors:
 
-1. [Joly0](https://github.com/Joly0) - Windows support via PowerShell.
+1. [Joly0](https://github.com/Joly0) [![Sponsor](resources/icons/sponsor-100x30.svg)](https://github.com/sponsors/Joly0) - Windows support via PowerShell.
 2. [Cory Galyna](https://github.com/corygalyna) - Repository & CI management.
 3. [Jean Shuralyov](https://github.com/JeanShuralyov) - Documentations.
-4. [(Holloway) Chew, Kean Ho](https://github.com/hollowaykeanho) - FFMPEG & UNIX Support via POSIX Shell and Polygot Script.
+4. [(Holloway) Chew, Kean Ho](https://github.com/hollowaykeanho) [![Sponsor](resources/icons/sponsor-100x30.svg)](https://www.hollowaykeanho.com/stores/) - FFMPEG & UNIX Support via POSIX Shell and Polygot Script.