README: updated with prerequisites

You need to load the game at least once, you need to have changed at least a single bind.

fixes #19

CHANGELOG.md

@@ -6,6 +6,13 @@
   to specify a binds file instead of auto-detecting it from the currently active
   preset.
 
+## Changed
+
+* Updated the README to reflect that you need to load the game once, and that
+  you need to have changed at least a single bind.
+* Updated the README to reflect that you have to use a single preset for all
+  sections if you’re playing Odyssey.
+
 # 4.0 (2021-05-19)
 
 **Note**: If you do not own Odyssey, everything will work just as before!

README.md

@@ -28,9 +28,18 @@ will be read automatically when VoiceAttack starts, and when they change.
 
 ## Usage
 
-You don’t have to do anything! When VoiceAttack loads, bindED will automatically
-detect your bindings. It will also keep a watchful eye on Elite’s bindings
-folder and reload them when there is a change!
+Before starting VoiceAttack with the plugin installed, make sure that you have
+loaded the game at least once! That will create the directory structure the
+plugin is going to read from. You also need to have changed _any_ key in
+controls options. You will probably have made some changes anyway.
+
+For Horizons players, that’s it! When VoiceAttack loads, bindED will
+automatically detect your bindings. It will also keep a watchful eye on Elite’s
+bindings folder and reload them when there is a change!
+
+For Odyssey players, there is an additional caveat: you have to use the same
+preset for all 4 sections (general, ship, SRV, foot). Sadly it’s not apparent
+from the files which binds belong to which.
 
 If something goes awry, you can still manually call the `loadbinds` plugin
 context to force a refresh.