README: add a play-now link and a screenshot of the live site

The root README never actually stated the live URL (only described the
Pages build pipeline mechanics) and had no images at all -- every per-lib
README already links mudlibs.fluffos.info/<slug>/, but the project's own
front door didn't say where to go. Added a top-of-file "Play now" link
plus the actual URL restated in the Quick Start section, and a
screenshot of the game gallery (docs/site-preview.png) so the README
shows what's actually there before anyone clicks through.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VyQCUoTo1Z93Py9aVFHQi1

Author: thefallentree

README.md

@@ -1,5 +1,9 @@
 # mudlibs — 98 restored classic Chinese LPC mudlibs, runnable natively and in the browser
 
+**▶ Play now, no install: https://mudlibs.fluffos.info/**
+
+![Screenshot of the mudlibs.fluffos.info game gallery](docs/site-preview.png)
+
 This repository preserves and restores the golden age of the Chinese MUD
 scene (mid-1990s to ~2015): **98 complete LPC mudlibs** (97 fully playable
 in the browser, 1 native-only by policy — see below) — 侠客行, 笑傲江湖,
@@ -25,12 +29,12 @@ one archive is BIG5 Traditional Chinese.
 
 ## Quick start — play in the browser
 
-The GitHub Pages site (built by `.github/workflows/pages.yml`) hosts every
-converted lib as a click-to-play page: it packs each `libs/<slug>/` tree
-into an in-memory filesystem image, pairs it with the prebuilt WASM
-FluffOS driver from the latest fluffos release, and generates an index
-page from the per-lib READMEs (`scripts/gen_site_index.py`,
-`scripts/wasm_status.json`).
+**https://mudlibs.fluffos.info/** — the GitHub Pages site (built by
+`.github/workflows/pages.yml`) hosts every converted lib as a click-to-play
+page: it packs each `libs/<slug>/` tree into an in-memory filesystem image,
+pairs it with the prebuilt WASM FluffOS driver from the latest fluffos
+release, and generates an index page from the per-lib READMEs
+(`scripts/gen_site_index.py`, `scripts/wasm_status.json`).
 
 To smoke-test a lib under WASM locally without a browser: