There is an initial generated .Net core client

[izgeri]

• Use the OpenAPI spec to generate an initial standalone .Net core client
• Ensure the client can be easily updated as the spec changes
• Ensure the client has solid test automation
• Ensure the client has basic documentation for usage instructions
• (Optional) Publish the client to Nuget (should probably be its own card)

Open questions:

• Should the client live in its own repo, or be a subdirectory in the OpenAPI spec project?
• How do the generated clients look? Should we consider building custom generator logic / templates to ensure a smoother transition to the new clients from our current SDK (like Bitmovin describes doing in their blog post - Section 2)