Update README.md

README.md

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 # NetHex
 A small rust utility for dumping data-layer network traffic
+
+```
+./net_hex --help
+NetHex 0.1.0
+Jack Newman
+A small utility for reading / writing directly to a network interface
+
+USAGE:
+    net_hex [FLAGS] [OPTIONS] <interface> [bytes]
+
+FLAGS:
+    -h, --help       Prints help information
+    -l, --list       List network interfaces
+    -V, --version    Prints version information
+
+OPTIONS:
+    -c, --count <count>        Number of packet to receive before exiting [default: -1]
+    -t, --timeout <timeout>    Timeout before exiting the program. Default no timeout
+
+ARGS:
+    <interface>    The network interface to send/read from
+    <bytes>        A hex string of raw bytes to send to the interface e.g. 11EE22FF
+```