Added the UDP relay program.
Added the UDP relay program.

I've used gcc to compile the program and linked with pthreads
- gcc *.c -lpthreads

NOTE: Make sure you have pthread_barrier_t support.

Running the program:
- ./a.out -p 2344 -i 192.168.1.101 -i 192.168.2.102 -i 192.168.3.103

The example above makes the program listen on port 2344 for incoming
UDP messages and relay them to the IP addresses mentioned with the
-i flag on port 2344.

pravinchandar/udpr