Create step by step walkthrough tutorial

[bobcatfish]

Expected Behavior

When someone wants to ramp up on this project, they should be able to follow along with a tutorial that explains to them how to create their own pipelines and interact with them.

We can initially cover a simple pipeline, e.g. the example kritis pipeline.

Requirements

• It should be possible to:
  1. Start from no pipeline or tasks at all
  2. Gradually build up a complete set of Pipelines, Tasks, PipelineParams
  3. Manually invoke a Task by creating a TaskRun
  4. Manually invoke a Pipeline by creating a PipelineRun
• There should be tests that cover this.
• The tutorial should cover actually deploying these to a k8s cluster using kubectl (e.g. like in the DEVELOPMENT.md).
• The solution should be available (could be link to https://github.com/knative/build-pipeline/tree/master/examples#example-pipelines if we use those examples as-is)

Initially this would not actually do anything, but as we start adding actual functionality we can build this up over time.

Additional Info

If you are feeling really ambitious, you could also cover the more complex guestbook pipeline which has both fan-in and fan-out.

[bobcatfish]

Since #143 might not be fixed, we should create a pipeline that builds and deploys an image.

We can iteratively add test results and logs later as we add functionality.

[nader-ziada]

/assign

[bobcatfish]

Thanks for taking care of this @pivotal-nader-ziada !! 🎉