Add mine equipment shed placeable scaffold

placeables/mineEquipmentShed/AUTODRIVE_LAYOUT.md

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+# AutoDrive Layout Notes
+
+The shed is designed around a simple one-way AutoDrive flow:
+
+1. Existing network enters at `AD_Entrance`.
+2. Route continues through the wide front opening to `AD_Exit`.
+3. Parking branches lead from the inner lane to `AD_Parking_01` through `AD_Parking_04`.
+4. Vehicles leave parking spots by reversing or looping back to `AD_Exit`, depending on your vehicle size and route style.
+
+## Recommended In-Game Setup
+
+- Use a straight connector from your yard road to `AD_Entrance`.
+- Add a slow-speed node just before the shed opening.
+- Create one destination per parking marker:
+  - `Mine Shed P1`
+  - `Mine Shed P2`
+  - `Mine Shed P3`
+  - `Mine Shed P4`
+- Keep the entrance lane about 10 m wide.
+- Avoid placing decorative props or collision pillars inside the middle lane.
+
+## Marker Coordinates
+
+These coordinates are local to the placeable root and must be converted by placement position in the savegame:
+
+| Marker | Local X | Local Y | Local Z | Purpose |
+| --- | ---: | ---: | ---: | --- |
+| AD_Entrance | 0 | 0 | -24 | Connection from yard network |
+| AD_Exit | 0 | 0 | -19 | Inner front lane node |
+| AD_Parking_01 | -14 | 0 | 6 | Large left bay |
+| AD_Parking_02 | -5 | 0 | 6 | Inner left bay |
+| AD_Parking_03 | 5 | 0 | 6 | Inner right bay |
+| AD_Parking_04 | 14 | 0 | 6 | Large right bay |
+