v1.0.0 Fortran intrinsic descriptions via CLI program and manpages

Descriptions of Fortran intrinsics as a system-agnostic Fortran utility
program; as well as man-pages. The program can be built with fpm(1) and
make(1) or a standalone single-file version is available as well. The
documentation is available via a module so the text can be used by other
programs as well. The documentation here is the origin of the fortran-lang
intrinsic descriptions; and continue to be maintained.