pio-device: add page (#5725)

pages/common/pio-device.md

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+# pio device
+
+> Manage and monitor PlatformIO devices.
+> More information: <https://docs.platformio.org/en/latest/core/userguide/device/>.
+
+- List all available serial ports:
+
+`pio device list`
+
+- List all available logical devices:
+
+`pio device list --logical`
+
+- Start an interactive device monitor:
+
+`pio device monitor`
+
+- Start an interactive device monitor and listen to a specific port:
+
+`pio device monitor --port {{/dev/ttyUSBX}}`
+
+- Start an interactive device monitor and set a specific baud rate (defaults to 9600):
+
+`pio device monitor --baud {{57600}}`
+
+- Start an interactive device monitor and set a specific EOL character (defults to `CRLF`):
+
+`pio device monitor --eol {{CRLF|CR|LF}}`
+
+- Go to the menu of the interactive device monitor:
+
+`Ctrl + T`