Add registry title and registry description slots (#240)

* add registry title and registry description slots

* add new slots to mapping registry class

* Update src/sssom_schema/schema/sssom_schema.yaml

Co-authored-by: Nico Matentzoglu <nicolas.matentzoglu@gmail.com>

* Update src/sssom_schema/schema/sssom_schema.yaml

Co-authored-by: Nico Matentzoglu <nicolas.matentzoglu@gmail.com>

* Update src/sssom_schema/schema/sssom_schema.yaml

Co-authored-by: Nico Matentzoglu <nicolas.matentzoglu@gmail.com>

* Update src/sssom_schema/schema/sssom_schema.yaml

Co-authored-by: Nico Matentzoglu <nicolas.matentzoglu@gmail.com>

Co-authored-by: Anita Caron <anitacaron@users.noreply.github.com>
Co-authored-by: Nico Matentzoglu <nicolas.matentzoglu@gmail.com>

src/sssom_schema/schema/sssom_schema.yaml

@@ -87,6 +87,12 @@ slots:
     description: The unique identifier of a mapping registry.
     range: EntityReference
     required: true
+  mapping_registry_title:
+    description: The title of a mapping registry.
+    range: string
+  mapping_registry_description:
+    description: The description of a mapping registry.
+    range: string
   imports:
     description: A list of registries that should be imported into this one.
     multivalued: true
@@ -526,6 +532,8 @@ classes:
       mapping set references, and can import other registries.
     slots:
       - mapping_registry_id
+      - mapping_registry_title
+      - mapping_registry_description
       - imports
       - mapping_set_references
       - documentation