Add the first licensed Hollywood reference board

CREDITS.md

@@ -45,6 +45,20 @@ stylized reconstruction. The Joke Shop is a fictional stand-in for the real
 Sunset Strip block; the game does not claim endorsement by, or an exact replica
 of, any real venue or tenant.
 
+### Development-only reference images
+
+The venue reference boards under `docs/screens/refs/` are development documentation and are not
+bundled with the game or its release packages. Files under CC BY are attributed here as well as in
+their folder sidecar:
+
+- `docs/screens/refs/hollywood/el-capitan-facade-day-wikimedia-2009-10-27.jpg` — "woo (Irvine, CA,
+  USA)", CC BY 2.0, via Wikimedia Commons.
+- `docs/screens/refs/hollywood/el-capitan-theatre-blade-sign-day-wikimedia-2008-10.jpg` — Andreas
+  Praefcke, CC BY 3.0, via Wikimedia Commons.
+- `docs/screens/refs/hollywood/premiere-staging-street-day-wikimedia-2006-02-12.jpg` — John
+  Barreiros, CC BY 2.0, via Wikimedia Commons.
+- Public-domain files in the same folder: Charles W. Beam (1922) and Gary Minnaert (2006).
+
 ## AI-assisted images
 
 Surface textures, skyline panoramas, UI art and concept references were produced