Update readme

README.md

@@ -182,15 +182,13 @@ That's it, you have successfully created a Webnative app! 🚀
 ## Basics
 
 WNFS exposes a familiar POSIX-style interface:
-- `add`: add a file
-- `cat`: retrieve a file
 - `exists`: check if a file or directory exists
 - `ls`: list a directory
 - `mkdir`: create a directory
 - `mv`: move a file or directory
-- `read`: alias for `cat`
+- `read`: read from a file
 - `rm`: remove a file or directory
-- `write`: alias for `add`
+- `write`: write to a file
 
 
 ## Versioning