docs: adding preliminary documentation

examples/reverse-shell/README.org

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+#+TITLE: Example reverse shell proof of concept
+
+This bind shell works through local host firewalls on Linux systems using UDP to send and receive messages
+
+* Setup
+** libpcap
+Follow the directions in the main README in order to pull in the libpcap dependency
+
+** Build the code
+Once the previous step is completed, run ~cargo build --release~ in a terminal.
+
+* Running the code
+First, open two shells. In one, run ~docker-compose up examples_reverseshell_target~, and in the other run ~docker-compose run examples_reverseshell_server~. It will be possible to type in commands to examples_bindshell_server and run them in the target container