#18 Add group short id and report id to authorise_participant response

Closes #18

Response changed to below

{
    "success": true,
    "organisation_id": "e424ce8e-aa78-4d26-ae93-5ab4c4a78a00",
    "group_short_id": "04b677bb-7d87-4da2-af36-c7e95fac47c9",
    "group_report_id": "A",
    "designation_groups": {
        "classmates": {
            "size": 18,
            "members": [
                {
                    "short_id": "9843fcac-eea8-45c0-a8ef-4239dee3525f"
                },
                {
                    "short_id": "fee45ac1-5076-4ab2-abee-abaf20ffb9ae"
                },
                {
                    "short_id": "31df33a2-0e22-401e-a8c0-00a496ad4f3d"
                },
                {
                    "short_id": "d75474c5-90c1-43da-9100-16b4af8d5a9c"
                },
                {
                    "short_id": "1e730019-0891-460e-a83a-96392879520c"
                },
                {
                    "short_id": "20a7a41c-60d7-4c6d-ba9b-8034ee07e71a"
                },
                {
                    "short_id": "e51584b7-d7aa-4f7c-98ae-2d4fe5324e96"
                },
                {
                    "short_id": "4a80ff0e-6766-4dc4-bbe2-46a780c398ef"
                },
                {
                    "short_id": "0da580ed-fc95-4404-8ae6-2bc5965ca3ef"
                },
                {
                    "short_id": "6ca1333c-33ee-46c1-8440-ed3b5f2cde0a"
                },
                {
                    "short_id": "06fc2616-4d9e-48e2-bc55-1c8bf04a8cb9"
                },
                {
                    "short_id": "8d7fae31-6156-4577-ba26-cb9751a53350"
                },
                {
                    "short_id": "b09be6ce-42a1-40c6-ad80-e16c13da4af5"
                },
                {
                    "short_id": "69585b92-23c5-4706-968d-3203c1dd6dfa"
                },
                {
                    "short_id": "26822eef-28a3-4281-89ad-78b9fc66b2a0"
                },
                {
                    "short_id": "646a6161-b9b0-47af-a85b-dd27bedd39c1"
                },
                {
                    "short_id": "894e5260-b91f-49ba-9f57-d4964ffc44e2"
                },
                {
                    "short_id": "2208d776-967e-494e-afe4-c8dc2c73118a"
                }
            ]
        }
    },
    "consent_participate": true,
    "consent_designate": true,
    "attributes": {
        "sex": "M",
        "birth_month": "06",
        "birth_year": "2011"
    }
}