docs: added sponsor

[ci skip]

README.md

@@ -24,6 +24,10 @@
 - [Translations](#translations) *(We need your help!)*
 - [Special Thanks](#special-thanks)
 
+<a target='_blank' rel='nofollow' href='https://app.codesponsor.io/link/roGruqDX64HMJwmnvjhaQ7kt/Requarks/wiki'>
+  <img alt='Sponsor' width='888' height='68' src='https://app.codesponsor.io/embed/roGruqDX64HMJwmnvjhaQ7kt/Requarks/wiki.svg' />
+</a>
+
 ## Requirements
 
 Wiki.js can run on virtually all platforms where Node.js can (Windows, Mac, Linux, etc.).