Document Azure Pipelines

[epage]

Azure Pipelines supports github

• Example configurations: https://github.com/graphql-rust/juniper/pull/263/files
• Related discussion: https://www.reddit.com/r/rust/comments/9ndo5k/travis_ci_now_supports_testing_windows_includes/e7lkv0u/?st=jn62u825&sh=2319d1f7

Why should we document this?

• Some users might prefer it
• It has the potential to reduce the boiler plate, ie no more trust

Would this be recommended over Travis? Unsure, we'll have to see how things evolve and learn from experience with each service.

Should we provide configuration templates? Eventually. It'll take some iteration to determine the right level of configurability so we don't lock people in.