Add week 4 materials

materials/04-group-comm/seminar/ip_multicast/receiver/Dockerfile

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+FROM python:3.12-slim
+
+COPY . .
+
+CMD ["python", "-u", "receiver.py"]

materials/04-group-comm/seminar/ip_multicast/receiver/receiver.py

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+import socket
+import struct
+
+
+if __name__ == '__main__':
+    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    sock.bind(('', 10000))
+    sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, struct.pack('4sL', socket.inet_aton('224.0.2.0'), socket.INADDR_ANY))
+    print("ready: joined 224.0.2.0, listening on UDP :10000", flush=True)
+    while True:
+        data, addr = sock.recvfrom(1024)
+        print(f'got message {data!r} from {addr}', flush=True)