Add Tab5 touch dashboard project

.gitignore

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+.pio/
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch/

README.md

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+# M5Stack Tab5 Touch Dashboard
+
+PlatformIO starter for the M5Stack Tab5. It demonstrates the 1280x720 display,
+touch buttons, a brightness slider, touch coordinates, memory, battery, Wi-Fi,
+and accelerometer status.
+
+## Build and upload
+
+```powershell
+pio run
+pio run --target upload
+pio device monitor --baud 115200
+```
+
+If needed, append the port: `--upload-port COM29`.
+
+## Controls
+
+- **RED**, **GREEN**, and **BLUE** change the central panel.
+- **RESET** restores the default and clears the counter.
+- Drag the bottom slider to change brightness.
+- Touching the colour panel draws a white marker.
+
+Current M5Unified and M5GFX versions support the different display/touch
+controller variants shipped in Tab5 units.
+
+## Next steps
+
+1. Connect Wi-Fi and show the IP address.
+2. Add an SD-card browser.
+3. Add camera and audio tests.
+4. Recreate the dashboard with LVGL widgets.
+
+## References
+
+- [Tab5 documentation](https://docs.m5stack.com/en/core/Tab5)
+- [M5Unified](https://github.com/M5Stack/M5Unified)
+- [M5GFX](https://github.com/M5Stack/M5GFX)

platformio.ini

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+[env:tab5]
+platform = https://github.com/pioarduino/platform-espressif32.git#54.03.21
+board = esp32-p4-evboard
+framework = arduino
+monitor_speed = 115200
+upload_speed = 1500000
+board_build.mcu = esp32p4
+board_build.flash_mode = qio
+build_flags =
+    -DBOARD_HAS_PSRAM
+    -DCORE_DEBUG_LEVEL=3
+    -DARDUINO_USB_CDC_ON_BOOT=1
+    -DARDUINO_USB_MODE=1
+lib_deps =
+    https://github.com/M5Stack/M5Unified.git
+    https://github.com/M5Stack/M5GFX.git