vcgencmd: add page (#6309)

pages/linux/vcgencmd.md

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+# vcgencmd
+
+> Print system information for a Raspberry Pi.
+> More information: <https://www.raspberrypi.org/documentation/raspbian/applications/vcgencmd.md>.
+
+- List all available commands:
+
+`vcgencmd commands`
+
+- Print the current CPU temperature:
+
+`vcgencmd measure_temp`
+
+- Print the current voltage:
+
+`vcgencmd measure_volts`
+
+- Print the throttled state of the system as a bit pattern:
+
+`vcgencmd get_throttled`
+
+- Print the bootloader config (only available on Raspberry Pi 4 models):
+
+`vcgencmd bootloader_config`
+
+- Display Help:
+
+`vcgencmd --help`