Adding readme

Author: eze210

README.md

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+# Covert Channel
+This project has been implemented as part of Cryptography signature in the Factultad de Ingeniería de la Universidad de Buenos Aires.
+
+## Compilation
+In order to compile the project, it is provided a CMake. User must run the following commands from the root folder:
+
+```sh
+mkdir build
+cd build
+cmake ..
+make
+```
+
+## Execution
+Once the project is compiled, there are two modes to run the program: as a sender, and as a receiver. Both of those modes need to run with root permissions, since it works with raw sockets.
+- To run the program as a sender, user must pass a dummy file name to send in the body of the udp messages. The actual message will be sent as part of the UDP header.
+- To run the program as a receiver, user must not pass any parameter to the executable.
+
+Since the build folder:
+```sh
+# As sender
+sudo ./bin/covertudp ../test/lorem_ipsum.txt
+
+# As receiver
+sudo ./bin/covertudp
+```
+
+The standard input of the sender should be written in the standard output of the receiver.