Added README in boost include directory [skip ci].
|This directory contains BOOST header files that were copied from BOOST version 1.56, which are required to provide consistent and correct output of the random number distributions provided by bob.core.random.|
|These header files are modified such that they work with our package; particularly, the namespace of the BOOST functions are changed bob::core::random, i.e., to assure that they overwrite the ones from BOOST version < 1.56.|
|The BOOST license applies. You can download the license from http://www.boost.org/LICENSE_1_0.txt.|
|If you have BOOST version 1.56 or greater installed, you can safely ignore/delete this directory.|