Add definition of ready and done

[jessiehuff]

Closes https://issues.redhat.com/browse/RHOAIENG-10271

Description

We need our Definition of Done and Definition of Ready docs moved into markdown files in the docs folder and our contribution markdown file updated to point at those

How Has This Been Tested?

N/A (Non-code change)

Test Impact

N/A

Request review criteria:

Self checklist (all need to be checked):

• The developer has manually tested the changes and verified that the changes work
• Commits have been squashed into descriptive, self-contained units of work (e.g. 'WIP' and 'Implements feedback' style messages have been removed)
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has added tests or explained why testing cannot be added (unit or cypress tests for related changes)

If you have UI changes:

• Included any necessary screenshots or gifs if it was a UI change.
• Included tags to the UX team if it was a UI/UX change.

After the PR is posted & before it merges:

• The developer has tested their solution on a cluster by using the image produced by the PR to main

[Griffin-Sullivan]

From the perspective of someone new who just went through all of the dev setup and contributing docs: LGTM

[andrewballantyne]

@dgutride This should be a DoR -- we moved away as far as we could from parallel work, I think we need this updated.

[andrewballantyne]

@jessiehuff please update the text from @Griffin-Sullivan, we can look to merge this and iterate as needed.

[openshift-ci]

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