Add README

README.md

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+# US West Coast — September 2026
+
+Group trip: SF → Yosemite → Sequoia → LA → Las Vegas.
+
+## Structure
+
+- [`itinerary.md`](itinerary.md) — full plan: timeline, day-by-day, bookings overview
+- [`bookings/`](bookings/) — one file per accommodation / transport booking
+- [`emails/`](emails/) — host messages and receipts
+- `*.pdf` — booking confirmations
+
+## Group
+
+KT & VT (Sofia) · MS & LK (Vancouver)