Add setup-fortran (#554)

Author: jwallwork23

data/package_index.yml

@@ -362,6 +362,12 @@
   version: 0.5.0
   license: MIT AND Apache-2.0
 
+- name: setup-fortran
+  github: fortran-lang/setup-fortran
+  description: GitHub action to setup Fortran compiler and toolchain
+  categories: programming
+  tags: continuous-integration
+
 - name: erloff
   gitlab: everythingfunctional/erloff
   description: Errors and logging for fortran