Bootstrap copied BFF and local accounts with public Sendico contracts (#34)

backend/contracts/sendico/models/storable.yaml

@@ -0,0 +1,22 @@
+components:
+  schemas:
+    Storable:
+      description: Common persistence metadata included on stored entities.
+      type: object
+      additionalProperties: false
+      required:
+        - id
+        - createdAt
+        - updatedAt
+      properties:
+        id:
+          description: Unique identifier assigned to the stored entity.
+          $ref: ./objectid.yaml#/components/schemas/ObjectId
+        createdAt:
+          description: RFC 3339 timestamp indicating when the entity was created.
+          type: string
+          format: date-time
+        updatedAt:
+          description: RFC 3339 timestamp indicating the most recent entity update.
+          type: string
+          format: date-time