Add organisation member invite schemas.

Towards NA-419.

pipeline/schemas/organisation_member_invite.py

@@ -0,0 +1,25 @@
+from .base import BaseModel
+
+
+class OrganisationMemberInviteBase(BaseModel):
+    #: The ID of the Organisation the invite relates to
+    organisation_id: str
+    #: The email the invite is to be sent to
+    email: str
+
+
+class OrganisationMemberInviteCreate(OrganisationMemberInviteBase):
+    """Create an invitation to join an Organisation."""
+
+    pass
+
+
+class OrganisationMemberInviteGet(OrganisationMemberInviteBase):
+    """View of an invitation to join an Organisation."""
+
+    #: The ID of this invite
+    id: str
+    #: If True this invite has been accepted (emailed link has been visited)
+    accepted: bool
+    #: If True the invitation has been linked with an existing User
+    has_user: bool