refactor: project structure (#9)

Split up project into multiple crates and use a Cargo workspace.

crates/asterctl-lcd/README.md

@@ -0,0 +1,17 @@
+# AOOSTAR WTR MAX / GEM12+ PRO UART Screen Protocol
+
+Reverse engineered [AOOSTAR WTR MAX](https://aoostar.com/products/aoostar-wtr-max-amd-r7-pro-8845hs-11-bays-mini-pc)
+UART display protocol, written in Rust.  
+This project should also support the GEM12+ PRO device.
+
+- [LCD Protocol](../../docs/lcd_protocol.md)
+- See [README](../../README.md) for more information about the `asterctl` screen control tool.
+
+## Display Information
+
+- **Resolution:** 960 × 376
+- **Manufacturer:** Synwit
+- **Connected over USB UART** with a proprietary serial communication protocol:
+    - **USB device ID:** `416:90A1` (as shown by `lsusb`)
+    - **Linux device (example on Debian):** `/dev/ttyACM0`
+    - **1,500,000 baud**, 8N1 (likely ignored; actual USB transfer speed is much higher)