Added USB Camera example #25

Job	Run time
build (examples/UnitTestExample)	52s
build (examples/ETHOTA)	51s
build (examples/HelloServer)	54s
build (examples/MQTTClient)	52s
build (examples/ESPMQTTSClient)	59s
build (examples/StaticIPAddress)	51s
build (examples/UDPClientReceiver)	58s
build (examples/UDPClientSender)	57s
build (examples/UDPClientReceiverDirectPC)	55s
build (examples/UDPClientSenderDirectPC)	55s
build (examples/AsyncUDPServer)	59s
build (examples/AsyncUDPClient)	53s
build (examples/WebSocketClient)	53s
build (examples/WebSocketServer)	57s
build (examples/TCPClient)	1m 2s
build (examples/TCPServer)	55s
build (examples/RS485_Master)	55s
build (examples/RS485_Slave)	51s
build (examples/RS485_ModBUS)	52s
build (examples/TFT_ILI9341_Shield)	56s
build (examples/SPI_Wire_DevicesExample)	55s
build (examples/WireExample)	52s
	20m 4s

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