Add note to README.md regarding when "details" is useful

Author: Electronic-Mango

README.md

@@ -92,8 +92,12 @@ Details function allows for looking up details for a single entry via its node I
 Node ID can be taken from output of the [`search`](#search) function.
 
 Output from this function contains the same data as a single entry from the [`search`](#search) function.
-There's no reason to first use the [`search`](#search) function, then use node ID from one of entries for this function.
 
+> **In general using this function is only useful if you have node ID already stored.**
+There's no reason to first use the [`search`](#search) function, then use node ID from one of entries for `details`, you won't get any additional information.
+If you want to get seasons/episodes you can use the ID from [`search`](#search) function to call [`seasons`](#seasons), and then [`episodes`](#episodes). Calling `details` on an individual season/episode won't give you more information than outputs from the dedicated commands.
+
+Usage is similar to [`search`](#search) function, just without `count` argument:
 ```python
 from simplejustwatchapi.justwatch import details