Added USB Camera example #22

Job	Run time
build (examples/UnitTestExample)	1m 6s
build (examples/ETHOTA)	56s
build (examples/HelloServer)	1m 3s
build (examples/SDWebServer)	58s
build (examples/MQTTClient)	50s
build (examples/ESPMQTTSClient)	50s
build (examples/StaticIPAddress)	1m 3s
build (examples/UDPClientReceiver)	47s
build (examples/UDPClientSender)	56s
build (examples/UDPClientReceiverDirectPC)	56s
build (examples/UDPClientSenderDirectPC)	58s
build (examples/AsyncUDPServer)	58s
build (examples/AsyncUDPClient)	55s
build (examples/WebSocketClient)	1m 0s
build (examples/WebSocketServer)	53s
build (examples/TCPClient)	57s
build (examples/TCPServer)	1m 0s
build (examples/InternetComTest)	57s
	17m 3s

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