Add RickPrompter teleprompter CAD, STLs and renders

Co-Authored-By: Claude Opus 5.5 <[email protected]>

README.md

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+# RickPrompter
+
+A DIY teleprompter built for the [Tangent Heavy Industries](https://tangentheavy.com) channel:
+a laser-cut 5 mm plywood hood, a picture-frame glass beamsplitter at 45°, a tablet lying flat
+underneath, and a Pixel 6 shooting through the glass from behind.
+
+![Render](Documents/Images/render.png)
+
+## Files
+
+| Path | What |
+|---|---|
+| `CAD/RickPrompt.FCStd` | FreeCAD source model (all panels, assembled) |
+| `CAD/RickPrompt-Pixel 6 Holder.step` | Pixel 6 phone holder |
+| `CAD/STL/` | One STL per body, exported in assembly position. The model has one side panel; `Side-Mirrored.stl` is the generated opposite side. |
+| `Documents/Images/` | Renders |
+
+All dimensions are in millimetres.
+
+## Design notes
+
+- **Beamsplitter:** 12x16 in picture-frame glass (clear, *not* "non-glare"/etched). Acrylic was
+  rejected: the camera shoots through the pane, so any waviness, sag or scratch haze ends up in
+  the footage. Thinner glass keeps the ghost image closer to the main one. Use large type.
+- **Orientation:** 16 in horizontal, 12 in up the slope. The Pixel 6 main lens is wide
+  (~82° diagonal), and width is the binding constraint. Keep the lens close to the glass,
+  roughly 135-185 mm from the glass centre.
+- **Screen tray recessed ~38 mm** below the glass's low edge. The bottom of the camera's view
+  passes through the pane and continues down-forward. A screen sitting in that wedge ends up in
+  frame and shines straight into the lens.
+- **Measure your camera's real video FOV before cutting.** Put the phone 600 mm from a wall, record,
+  and mark the frame edges: `tan(half-angle) = width / 1200`.
+
+## Known issues (first shoot)
+
+- The top edge of the glass showed in frame. The fix is to slide the pane 25-40 mm further up the
+  same 45° plane; the hood ceiling and low-edge rail follow. The model does not include this yet.
+- Silicone does not bond to painted ply. Mount the glass with printed slotted clips instead,
+  with the bottom clips carrying the load.
+- For better framing, tilt the whole rig down ~7° rather than lowering the camera.
+
+## License
+
+[CC BY-NC-SA 4.0](LICENSE).