Add example cmake generation command
Add example cmake generation command

NobbZ/xcpp,daniellehrner/xcpp,exercism/xcpp,oalbe/xcpp,exercism/xcpp,patricksjackson/xcpp,patricksjackson/xcpp,oalbe/xcpp,daniellehrner/xcpp,lukasz-m-maciejewski/xcpp,NobbZ/xcpp,lukasz-m-maciejewski/xcpp