Revert "Delete .gitignore"

This reverts commit 76314813e37dceee151b4e39bb133296fb9c7cc3.
Revert "Update .gitignore"

This reverts commit 028990a4ce360ac800b187399b8a5d24f804af3b.
Revert "Revert "Update .gitignore""

This reverts commit 7b4aa3dd825500cd723acac02379d90096a7bd6e.