Add OpenFOAM to main index doc

Author: kks32

mkdocs.yml

@@ -82,6 +82,7 @@ nav:
     - App Discovery: examples/apps.md
     - MPM Job Submission: examples/mpm.md
     - OpenSees Job Submission: examples/opensees.md
+    - OpenFOAM Job Submission: examples/openfoam.md
     - Database Queries: examples/database.md
   - API Reference:
     - Overview: api/index.md