Add sponsors section to README (#4009)

Co-authored-by: SpawnBox-dev <github@spawnbox.app>
Co-authored-by: SpawnBox-dev <developer@spawnbox.app>

docs/img/banner-docs.txt

@@ -6,7 +6,7 @@ Small, none, Minecraftia
 
 Line 2:
 "Documentation"
-Large, non, Minecrafter
+Large, none, Minecrafter
 
 Overall settings:
 - drop shadow

docs/img/banner-sponsors.txt

@@ -0,0 +1,9 @@
+Generated at https://textcraft.net/
+
+Line 1:
+"Sponsors"
+Mid
+None
+Minecrafter
+Drop shadow
+3d-style view