Merge pull request #154 from certik/f90

Add a link to fortran90.org

Author: certik

_data/learning.yml

@@ -47,7 +47,11 @@ reference-links:
   - name: Fortran wiki
     url: http://fortranwiki.org/
     description: A rich collection of Fortran articles and resources in an editable wiki format
-    
+
+  - name: Fortran 90 org
+    url: https://www.fortran90.org/
+    description: Fortran Best Practices guide, Python/Fortran Rosetta Stone, Fortran FAQ
+
   - name: "Fortran 2018 Standard Interpretation Document"
     url: https://j3-fortran.org/doc/year/18/18-007r1.pdf
     description: "J3/18-007r1 F2018, specification of the base Fortran 2018 language"