feat: sensical user invitation

Users can now be invited to an org by email.

"Email" for now is "print to stdout"

Resolves #12

src/user/schemas.py

@@ -3,7 +3,7 @@ Pydantic models for the user module
 """
 
 from typing import Optional
-from pydantic import Field
+from pydantic import Field, EmailStr
 
 from src.schemas import CustomBaseModel
 
@@ -55,3 +55,12 @@ class UserResponse(CustomBaseModel):
 class OrgResponse(CustomBaseModel):
 	org_id: int
 	name: str
+
+
+class UserPostInvitationRequest(CustomBaseModel):
+	organisation_id: int
+	user_email: EmailStr
+
+
+class UserPostInvitationAcceptRequest(CustomBaseModel):
+	jwt: str