Add fortran-lang/stdlib package. (fortran-lang#55)

Author: zoziha

registry.toml

@@ -111,6 +111,9 @@ latest.git = "https://github.com/awvwgk/simple-dftd3.git"
 [sqliteff]
 "latest" = {git="https://gitlab.com/everythingfunctional/sqliteff"}
 
+[stdlib]
+"latest" = {git="https://github.com/fortran-lang/stdlib", tag="stdlib-fpm"}
+
 [strff]
 "latest" = {git="https://gitlab.com/everythingfunctional/strff"}