installation instructions for milestone1, missing doxygen requirement

cmake requires doxygen, but doxygen is not listed as a requirement in the readme

Additional packages to install with apt: doxygen graphviz

Additional packages to install with apt: libboost-dev corsika/logging/Logger.h:26:10: fatal error: boost/format.hpp: No such file or directory

CMake needs a FindPackage for Boost, so that it may be installed in a non-standard include directory.

created branch 60-installation-instructions-for-milestone1-missing-doxygen-requirement

mentioned in merge request !15 (closed)

mentioned in merge request !16 (merged)

closed via merge request !16 (merged)

mentioned in commit 334037ba