update README

README.md

@@ -17,9 +17,21 @@ This is mostly a "fun project" and consists mostly of code I already wrote.
 
 # Usage
 
+Make the following directories where you will run retrovnc in:
+
+- `config`
+- `system`
+- `save`
+
+These folders are used either by retrovnc or cores to store data.
+
+For the most basic usecase:
+
 `$ retrovnc --core <CORE> --rom <ROM>` (see `retrovnc --help` for more options)
 
-For disc-based titles it is probably a good idea to pass the cuesheet file. I will implement stuff later to make this less annoying.
+E.g: to use swanstation (assuming you have placed requirements in the system folder):
 
+`retrovnc --core cores/swanstation_libretro.so --rom roms/my_game.cue`
 
+After launching a core for the first time, a TOML file in config/ is created to allow you to set core options. You may use this file to set any option given by the core.