Add depicted_by field to PSO.md (#2868)

* Add depicted_by field to PSO.md

Added depicted_by field with image URL for Planteome

* Fix ordering of fields in ontology/pso.md

---------

Co-authored-by: Deepak <deepakunni3@users.noreply.github.com>

Author: cooperl09

ontology/pso.md

@@ -9,6 +9,7 @@ contact:
   orcid: 0000-0002-6379-8932
 dependencies:
 - id: ro
+depicted_by: https://raw.githubusercontent.com/Planteome/plant-ontology/refs/heads/master/Planteome_profile.jpg
 description: The Plant Stress Ontology describes biotic and abiotic stresses that a plant may encounter.
 domain: agriculture
 homepage: https://github.com/Planteome/plant-stress-ontology