Document product integration for adding network policies

Details:

• Expectations for network policies in Big Bang (default deny)
• Identifying and adding ingress policies
• Identifying and adding egress policies
• Validating that package is not being blocked by policies and ingress/egress are working

NOTES:

• Use PodInfo as the example app in all instructions. We want someone following the documents from beginning to end able to add podinfo into Big Bang.
• Placeholders for docs will be created in this MR. Format is markdown.
• Any overlapping sections in the original package integration doc should be cleaned up with references to this doc. The original may be renamed to package-integration-supported.md.