README as a small game website in Crookfinger's voice; INSTALL.md, BESTIARY.md, playable standalone file

- README: logo, badges (Rust, WebAssembly, Claude Code, MIT), intro addressed to the master, features with screenshots, the household, how to play, licences and credits
- INSTALL.md: server, PWA, building, tests, savegame service and API, languages, how to refresh generated files
- BESTIARY.md generated from the game's data (tools/make_bestiary.py) with exported sprites and icons (docs/img, test export_doc_images)
- play/DungeonCraft.html: the whole game in one file to download and play offline

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.dockerignore

@@ -1,3 +1,5 @@
 target
 .git
 server
+docs
+play