REAME and CONTRIBUTING updates

[l0rd]

What does this PR do?

• Add information about what DWO does and how to use it in README.md
• Move configuration (dwoc) documentation under docs/dwo-configuration.md
• Move development documentation in CONTRIBUTING.md

What issues does this PR fix or reference?

#1334

Is it tested? How?

The instructions in the new section have been tested on developer sandbox.

PR Checklist

• E2E tests pass (when PR is ready, comment /test v8-devworkspace-operator-e2e, v8-che-happy-path to trigger)
  • v8-devworkspace-operator-e2e: DevWorkspace e2e test
  • v8-che-happy-path: Happy path for verification integration with Che

[ibuziuk]

Great contribution, thank you!

[dkwon17]

@l0rd sorry, could you add the fix in this commit I've added: 12b527f into a signed-off commit? I will merge this PR right after that.

[l0rd]

@l0rd sorry, could you add the fix in this commit I've added: 12b527f into a signed-off commit? I will merge this PR right after that.

Thank you @dkwon17. I have included your change in the last commit of this PR.

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dkwon17, ibuziuk, l0rd

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