UDP Sender

Create a new program that yeets UDP packets at a server. We want to fully understand the difference between TCP and UDP.

1. Create a new main.go in a new cmd/udpsender directory that can be run with go run ./cmd/udpsender
2. The program should start by using net.ResolveUDPAddr with the "udp" network to resolve the address localhost:42069
3. Use net.DialUDP to prepare a UDP connection, and defer the closing of the connection.
4. Create a new bufio.Reader that reads from os.Stdin
5. Start an infinite loop that:
   • Prints a > character to the console (to indicate that the program is ready for user input)
   • Reads a line from the bufio.Reader using reader.ReadString, and log any errors
   • Writes the line to the UDP connection using conn.Write, and log any errors
6. In a separate terminal, run nc -u -l 42069 to listen for UDP packets and log them to the console.

   On some systems you may need to add the -k flag to keep the listener running after the first packet is received: nc -u -l -k 42069

7. Use go run ./cmd/udpsender to run your program. Type in some messages and hit Enter. You should see the messages appear in the netcat terminal.
8. Turn off the netcat listener by hitting Ctrl+C in the terminal.
9. Restart your program, and try to send a message. You should not see any errors, because UDP doesn't care if the receiver is listening or not!

However, your OS might yeet you like UDP yeets packets.