include the readme in the doxygen documentation

README.md

basicmath.cpp

compcache.cpp

compile-win.cpp

compile.cpp

doc/DoxygenLayout.xml

doc/libeisgenerator.doxygen.in

doc/mainpage.md.in

doc/modelspage.md.in

eisgenerator/basicmath.h

eisgenerator/componant/cap.h

eisgenerator/componant/componant.h

eisgenerator/componant/constantphase.h

eisgenerator/componant/finitetr.h

eisgenerator/componant/inductor.h

eisgenerator/componant/paralellseriel.h

eisgenerator/componant/resistor.h

eisgenerator/componant/warburg.h

eisgenerator/eistype.h

eisgenerator/log.h