GIT: add .gitignore to ignore the generated doc/ directory
GIT: add .gitignore to ignore the generated doc/ directory

Signed-off-by: Luka Perkov <fe6d8aafe911b69ec3eecb89e7941038c0d25a22@sartura.hr>

PavolVican/libyang,lukasmacko/libyang,PavolVican/libyang,PavolVican/libyang,lukasmacko/libyang,PavolVican/libyang,PavolVican/libyang