Update development guide on creating new CRDs

[Tomcli]

/kind documentation

Changes

While doing some development on Tekton, I realized that the development doc is pointing to the removed condition feature. We should update the doc to point to a new existing v1alpha1 CRDs so that other new developers can follow how to create a new CRD.

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
• Has Tests included if any functionality added or changed
• Follows the commit message standard
• Meets the Tekton contributor standards (including functionality, content, code)
• Has a kind label. You can add one by adding a comment on this PR that contains /kind <type>. Valid types are bug, cleanup, design, documentation, feature, flake, misc, question, tep
• Release notes block below has been updated with any user facing changes (API changes, bug fixes, changes requiring upgrade notices or deprecation warnings)
• Release notes contains the string "action required" if the change requires additional action from users switching to the new release

Release Notes

NONE

[tekton-robot]

Hi @Tomcli. Thanks for your PR.

I'm waiting for a tektoncd member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[Tomcli]

/kind documentation

[afrittoli]

/ok-to-test

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lbernick

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[jerop]

@Tomcli please squash the commits

[Tomcli]

thanks @jerop I squashed my commits

[Tomcli]

/test pull-tekton-pipeline-integration-tests

[jerop]

/lgtm