init project structure and instructions

worlds/README.md

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+---
+type: folder
+---
+
+# Worlds
+
+Each subfolder here is a distinct world/campaign setting. Worlds are reusable — multiple campaigns can take place in the same world across different eras or continents.
+
+## Structure for Each World
+
+```
+world-name/
+├── overview.md          # Cosmology, history, tone, magic rules
+├── geography/           # Continents, regions, kingdoms, maps
+├── factions/            # Organizations, guilds, religions, orders
+├── npcs/                # World-level NPCs (reusable across campaigns/eras)
+├── lore/                # Myths, legends, major historical events
+└── creatures/           # Homebrew monsters, regional ecology
+```
+
+## Getting Started
+
+1. Create a new folder for your world (e.g., `worlds/eldoria/`)
+2. Create `overview.md` and fill in the basics
+3. Add subfolders as needed for geography, factions, etc.