Update API-doc-FORD-file.md (#9)

Co-authored-by: Jeremie Vandenplas <[email protected]>

Author: perazz

API-doc-FORD-file.md

@@ -43,6 +43,7 @@ project_website: https://stdlib.fortran-lang.org
 favicon: doc/media/favicon.ico
 license: by-sa
 author: fortran-lang/stdlib contributors
+author_pic: https://fortran-lang.org/en/_static/fortran-logo-256x256.png 
 email: [email protected]
 github: https://github.com/fortran-lang
 twitter: https://twitter.com/fortranlang