readme and docs: german and english game versions supported, what happens with other versions

README.md

@@ -47,8 +47,14 @@ More pictures:
 ## Get it
 
 You need **your own copy of the game** (the CD or an ISO image of it). Nothing else – LlamaMod
-brings everything it needs (also Java). Development used the German CD; other language versions
-should work but are untested.
+brings everything it needs (also Java).
+
+**Supported game versions:** the **German CD** (*Ein Königreich für ein Lama*, `groove.exe` of
+2001-02-12 – the version everything was developed and tested with) and the **English first release**
+(*The Emperor's New Groove*, `groove.exe` of 2000-10-17). With any other version the level mods
+(Test World, Arena, Coaster, your own levels, Mirror, Randomizer, Draw distance, Debug wireframe)
+should still work; the mods marked *modifies groove.exe* stop with a clear message instead – then
+please send us that `groove.exe` so we can add it.
 
 ### Install in 5 steps