Updated gitignore to work properly with XCode, swift and objective c.
Updated gitignore to work properly with XCode, swift and objective c.

OlegNovosad/Severenity,OlegNovosad/Sample,OlegNovosad/Severenity,OlegNovosad/Severenity,OlegNovosad/Severenity,OlegNovosad/Severenity,OlegNovosad/Severenity