feat: add a new awesome feature

examples/register-viewer/README.md

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+# Register Viewer (StellarX example)
+
+**A 32-bit register visualizer built with StellarX** (Windows + EasyX).  
+Features:
+- 32 toggle bits (MSB→LSB = 31..0)
+- Range invert, logical left/right shift
+- Hex/Decimal display with signed/unsigned toggle
+- Grouped binary view with "last/current" snapshots
+- One-click set all 0 / all 1
+
+## Build & Run
+1. Ensure StellarX and EasyX are in your include/lib paths.
+2. Build as a normal C++ Win32 desktop app (e.g., VS 2019+).
+3. Run the executable.
+
+This example demonstrates StellarX APIs with a single `main.cpp` (~450 LOC):
+`Window / Canvas / Button / Label / TextBox` + simple event callbacks.