Work in progress.

Defines AzurePipelines templates for use by Netstandard and .Net Core Nuget packages: https://docs.microsoft.com/en-us/azure/devops/pipelines/process/templates?view=vsts#using-other-repositories

• macOS, Linux and Windows test runs.
• Code coverage report generation and publishing.
• Versioning using a changelog, git tagging.
• Dependency caching.
• Publishing of CI builds

• Symbols using source link.
• Allowing dotnet test from solution directory.
• Enabling xml documentation
• Adding an icon for nuget.org
  • PackageIconUrl
  • NuGet/Home#352
• Customizing build number for CI builds - https://docs.microsoft.com/en-us/azure/devops/pipelines/build/options?view=vsts&tabs=yaml