Suggested list of projects to add to landscape

[MarckK]

This is a list of potential project to consider adding to the CDF landscape, not a task list.

These projects are part of the CNCF landscape within the Continuous Integration & Delivery category.

Note: We don't want to simply replicate the CNCF landscape, but there will be cross over within the CI/CD and other categories.

For PRs which add a project listed below, please link to this issue.
If you have a doubt on the best category for a project, please discuss on this issue, or on the PR which adds the project.

• Argo - Pipeline Orchestration
• Concourse - Pipeline Orchestration
• Flagger - Pipeline Orchestration
• Flux -Pipeline Orchestration
• GitHub Actions - Pipeline Orchestration
• Appveyor
• AWS CodePipeline
• Azure Pipelines
• Bamboo
• Brigade
• Buildkite
• Cloud 66 Skycap
• Cloudbees Codeship
• Codefresh
• D2iQ Dispatch
• GoCD
• Google Cloud Build
• HyScale
• Keploy
• Octopus Deploy
• OpenGitOps
• OpenKruise
• Razee
• Semaphore
• TeamCity
• werf
• Woodpecker CI
• XL Deploy