Setup CI & CD using GitHub Actions

[DamianEdwards]

CI setup now. CD to come.

[DamianEdwards]

CD of packages built from main is done now. They get published to the repo artifacts feed.

Need to figure out some further actions for:

• ~CI of PRs and branches that just builds/tests~
• Promotion of any main package to NuGet
  • This would simply take the package as is from the repo feed and push it to NuGet
  • It would create a repo release/tag
  • Twitter announcement (example)?
• Something for stable releases

[DamianEdwards]

Relevant articles:

• https://acraven.medium.com/a-nuget-package-workflow-using-github-actions-7da8c6557863

[DamianEdwards]

This was done!