Add force add capability to handle case where users want to force adds to take place even for currently empty files
Add force add capability to handle case where users want to force adds to take place even for currently empty files

gforcada/isort,PyCQA/isort,AbsoluteMSTR/isort,jmullan/isort,tomviner/isort,jamesbroadhead/isort,graingert/isort,graingert/isort,jamesbroadhead/isort,leepa/isort,levic/isort,adamchainz/isort,tomviner/isort,levic/isort,aequitas/isort,wimglenn/isort,aequitas/isort,AbsoluteMSTR/isort,gforcada/isort,jmullan/isort,leepa/isort,PyCQA/isort,adamchainz/isort,wimglenn/isort,pahko/isort,pahko/isort