UDP Socket application to read current time from network.

This is an UDP example to read current UTC time by sending request to NIST Internet Time Service.

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+### Getting started with the UDPSocket API ###
+ 
+UDP Example
+This application reads the current UTC time by sending UDP packet to time.nist.gov address at port 37.
+ 
+**Note:** The current example is limited to the ethernet interface on supported devices.
+To use the example with a different interface, you will need to modify main.cpp and
+replace the EthernetInterface class with the appropriate interface.