Add Freebuff domain list (#4014)

data/category-dev

@@ -20,6 +20,7 @@ include:flatpak
 include:flutter
 include:fontawesome
 include:framer
+include:freebuff
 include:gemfury
 include:gitbook
 include:github

data/freebuff

@@ -0,0 +1,5 @@
+# Freebuff - https://freebuff.com/
+# Source: https://github.com/CodebuffAI/freebuff
+
+codebuff.com
+freebuff.com