[Shipments] - Shipments of goods purchase order

[dorucioclea]

User story:

I need to be able to confirm receipt of shipment of goods and thereby release remaining agreed funds to exporter

Acceptance criteria

• The importer while viewing a specific transaction should see the corresponding purchase contract and the details.
• The importer should see details of the delivery and either approve the delivery of the goods or reject based on the purchase contract.
• If the goods are accepted then the payment should be released from the escrow function to the exporter and the repayment plan should be initiated.
• If the goods are rejected by the importer then the payment should not be released and the arbitration process should begin.

Development:

• Additional functionality on the Purchase order smart contract
  • Ability to sign approve/reject whether goods met the original purchase order specification