task 19: add task readme

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+Task 19
+=======
+
+Handling delayed work is easy now, right?  So, time to move on to
+something totally different.  How about networking?  We have been
+ignoring that part of the kernel, so let us now focus on the network
+side of the kernel, as that is a huge reason for why Linux has taken
+over the world.
+
+For this task, write a netfilter kernel module that does the following:
+
+  - monitors all IPv4 network traffic that is coming into the machine
+
+  - prints the id to the kernel debug log if the network traffic stream
+    contains your id.
+
+  - properly unregisters you from the netfilter core when the module
+    unloads.
+
+Test this by sending yourself an email with your id in the subject, much
+like the email you need to send back to me.
+
+Send in the proof and the .c file for the module.