llama coaster: ride the catacombs coaster cart on a new track (loop or grand circuit with drops, climbs, boosts, spin pads and jumps), 1-3 laps, three speeds, coins; offline cart simulation checks every jump and climb; roller coaster chapter in the strats docs

docs/README.md

@@ -51,7 +51,7 @@ tutorials (first level, parkour, editing an original level, Blender import)
 * [The script language](strats/script-language.md): writing new behaviour
 * [Customising strats](strats/custom-types.md): constants, imports, clones, custom types, mods
 * [Example: the Alligator Arena](strats/arena.md): a complete minigame explained step by step
-* [Example: the roller coaster](strats/roller-coaster.md): coming soon
+* [Example: the roller coaster](strats/roller-coaster.md): a new ride for the game's own coaster cart – track data and waypoints, no new strat code
 
 **[Tools](tools.md)** – LlamaMod's launcher, editor and command line, the Python kit, the in-game
 test harnesses