Add cmake files

tests/xua_unit_tests/README.md

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+# xua_unit_tests test application
+
+This example builds the xua_unit_tests application for XCORE AI
+
+## Prerequisites for building
+
+[XMOS Toolchain 15.0.3](https://www.xmos.com/software/tools/) or newer.
+
+Install [CMake](https://cmake.org/download/) version 3.13 or newer.
+
+## Building for xCORE
+
+Set environment variable for lib_xua path:
+
+    > export XUA_PATH=<path to lib_xua>
+
+cd to lib_xua/tests/xua_unit_tests
+
+Run cmake and build
+
+    > cmake .
+    > make
+
+## Run on hardware
+
+Ensure your XCORE AI EXPLORER board is powered up and connected to the XTAG debugger.
+Make sure the input.wav file is copied into the build directory
+
+    > pytest -n 1
+
+
+You should see the tests collected by pytest pass