add note about MIPS opewrt configure options

Signed-off-by: Andy Green <andy.green@linaro.org>
improve test server poll loop docs

Signed-off-by: Andy Green <andy.green@linaro.org>
add README

Signed-off-by: Andy Green <andy.green@linaro.org>
Added build instructions for CMake.

Also changed it so that specifying the include directories for CyaSSL is nicer.