Add pHPitz description and change the model order

Author: kvashchuka

backend/src/acidwatch_api/models/__init__.py

@@ -1,4 +1,4 @@
-from . import phpitz, tocomo, arcs, solubilityccs, gibbs_minimization_model
+from . import tocomo, arcs, solubilityccs, gibbs_minimization_model, phpitz
 
 
-__all__ = ["phpitz", "arcs", "tocomo", "solubilityccs", "gibbs_minimization_model"]
+__all__ = ["arcs", "tocomo", "solubilityccs", "gibbs_minimization_model", "phpitz"]

backend/src/acidwatch_api/models/phpitz.py

@@ -46,7 +46,7 @@ class PhpitzAdapter(BaseAdapter):
         "S8",
         "HNO2",
     ]
-    description = ""
+    description = "Computational model developed by Baard Kaasa as part of our CCS research on CO2 Impurities."
 
     parameters: PhpitzParameters
     category = "Primary"