Add donation button and format adjustments in README

Added a Ko-fi button for donations and adjusted formatting.

Author: l-const

README.md

@@ -1,5 +1,8 @@
 <div align="center">
   <img src="logo.svg" alt="Shortcuts Overlay Logo" width="200"/>
+  
+   [![ko-fi](https://ko-fi.com/img/githubbutton_sm.svg)](https://ko-fi.com/X8X11TFAZL)
+  
 </div>
 
 <div align="center">
@@ -8,10 +11,11 @@
   <img src="./assets/shortcut-overlay.gif" alt="Shortcuts Overlay Demo" width="800"/>
 
   <img src="./assets/corner-radius-clipping-no-blur.png" alt="Shortcuts Overlay rounded coners no blur" width="800"/>
-  
+ 
 </div>
 
 
+
 A keyboard shortcuts overlay for the COSMIC™ DE in a semi-transparent overlay surface. 
 - [X] The overlay is *only* displayed  as long as a specific predefined hotkey is pressed, similar to how
    it works on Android for various tablets.