Instructions for Postman suite for local development

[marcgs]

Feature agera-edc/DataspaceConnector#194 After https://github.com/eclipse-dataspaceconnector/DataSpaceConnector/issues/1264

Description

Extend MVD instructions to include how to create a Postman collection out of the OpenApi with requests for contract negotiation and data transfer to enable manual testing of MVD without having to run system tests.

Acceptance Criteria

• [ ] The MVD README is extended with instructions how to generate a Postman collection out of the EDC OpenApi

Tasks

• [ ] Research how to create a Postman collection out of an Open API definition.
• [ ] Add step-by-step instructions to README file mentioned in ACs.
• [ ] Verify instructions manually to confirm no steps missing.

[zeier]

Moved to feature agera-edc/DataSpaceConnector#194

[algattik]

This requires https://github.com/eclipse-dataspaceconnector/DataSpaceConnector/issues/1264 to be fixed first.

Currently, performing requests using templates generated from the OpenAPI definition results in invalid requests.