Update 'server/first_packet.py'

server/first_packet.py

@@ -1,3 +1,5 @@
+# Using the source code and instructions from: https://inc0x0.com/tcp-ip-packets-introduction/tcp-ip-packets-3-manually-create-and-send-raw-tcp-ip-packets/
+
 import socket
 
 s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_TCP)