Revert "remove license file"
Revert "remove license file"

This reverts commit 1619474fa6a79fd692599931a0a9cca23533bd8b.

ReimarBauer/staged-recipes,stuertz/staged-recipes,goanpeca/staged-recipes,goanpeca/staged-recipes,jakirkham/staged-recipes,kwilcox/staged-recipes,stuertz/staged-recipes,johanneskoester/staged-recipes,johanneskoester/staged-recipes,hadim/staged-recipes,mariusvniekerk/staged-recipes,hadim/staged-recipes,ocefpaf/staged-recipes,jakirkham/staged-recipes,ReimarBauer/staged-recipes,mariusvniekerk/staged-recipes,conda-forge/staged-recipes,conda-forge/staged-recipes,ocefpaf/staged-recipes,kwilcox/staged-recipes