added event example

examples/AllEventHandling/README.md

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+# All Event Handling Example
+
+This example demonstrates all available event types in Crafter.CppDOM:
+
+## Events Demonstrated
+
+### Mouse Events
+- Click
+- Mouse Over
+- Mouse Out
+- Mouse Move
+- Mouse Down
+- Mouse Up
+
+### Keyboard Events
+- Key Down
+- Key Up
+- Key Press
+
+### Focus Events
+- Focus
+- Blur
+
+### Form Events
+- Input
+- Change
+
+### Window Events
+- Resize
+- Scroll
+- Context Menu
+
+### Drag and Drop Events
+- Drag Start
+- Drag End
+- Drag Over
+- Drag Enter
+- Drag Leave
+- Drop
+
+### Wheel Events
+- Wheel (Mouse wheel scrolling)
+
+## How to Run
+
+1. Build the project using the build system
+2. Run the executable with `./run.sh`
+3. Open your browser to `http://localhost:8080`
+
+The demo will show various event handlers in action through interactive elements.