Add usage instructions for the switch to README.md (#1)

* Add usage instructions for the switch

* Add more context to `override_config.ini` workaround

README.md

@@ -6,6 +6,31 @@ A PlayStation Vita to Horizon OS (Nintendo Switch OS) translation layer (**not**
 PlayStation Vita (ARMv7 CPU) executables can be run natively on Nintendo Switch ARMv8 CPU in 32-bit execution mode.
 When loading a PlayStation Vita executable, _vita2hos_ redirects the [module](https://wiki.henkaku.xyz/vita/Modules) imports of said executable to jump to routines that implement the same behavior, by using native Horizon OS services, like the one exposed by the original PlayStation Vita OS modules.
 
+### How can I use it?
+
+1. Copy `vita2hos.nsp` to your microSD card (i.e. to: `atmosphere/vita2hos.nsp`)
+2. Create [atmosphere/config/override_config.ini](https://github.com/Atmosphere-NX/Atmosphere/blob/master/config_templates/override_config.ini) and add the following lines to it:
+
+ ```ini
+ [hbl_config]
+ override_any_app=true
+ override_any_app_key=R
+ override_any_app_address_space=32_bit
+ ; adjust the path according to the location of your file
+ path=atmosphere/vita2hos.nsp
+
+ ```
+
+ - Note: As long as this file exists you won't be able to use the homebrew menu and instead will always run vita2hos.
+
+ A quick workaround would be to rename the file and restart your Switch.
+ Unfortunately `override_config.ini` doesn't allow multiple `path` entries which is why it has to be done this way.
+
+3. Copy a PSVita `.velf` to the root of your microSD card and rename it to `test.elf`
+4. Boot (or reboot) your Switch and start any game while holding down `R`
+ - Attempting to use `vita2hos` via applet mode (album button) will currently result in a fatal error and wouldn't be recommended anyway.
+5. Enjoy!
+
 ### Special Thanks
 A few noteworthy teams/projects who've helped along the way are:
 * **[Vita3K](https://vita3k.org/)**