Added README

Signed-off-by: Ondřej Hlavatý <[email protected]>

Author: Aearsis

README.md

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+## Match-Action Tables
+
+This is a demonstration implementation of the subsystem proposed in my Master
+thesis, under working title Match-Action Tables, MAT for short.
+
+The code is written in a kernel-like way, in an environment that simulates the
+Linux kernel. The subsystem code is therefore similar to what it would look
+like if implemented as a module, but can be run and tested in userspace.
+
+### Usage
+
+First, you have to compile the sources. On Linux, it should be fairly easy:
+
+```bash
+$ make
+````
+
+Then, several testcases are created under the `tests/` directory. To run them
+all and check whether everything is OK:
+
+```bash
+$ ./test.sh
+```
+
+The source code of the tests should be the starting point of your journey
+through the implementation. They are written as scenarios, showing the expected
+usage of the subsystem.