doc: add CONTRIBUTING.md

[camilamacedo86]

Description of the change:
Add CONTRIBUTING.md doc which was missing in the repo.

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: camilamacedo86
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[camilamacedo86]

c/c @njhale

[camilamacedo86]

/test e2e-aws-olm

[camilamacedo86]

/test e2e-aws-olm

[camilamacedo86]

/test e2e-aws-olm
/test e2e-gcp

[camilamacedo86]

/test e2e-aws-olm

[camilamacedo86]

/test e2e-aws-olm

[camilamacedo86]

/test e2e-tests

[openshift-ci-robot]

@camilamacedo86: The specified target(s) for /test were not found.
The following commands are available to trigger jobs:

• /test e2e-aws-console-olm
• /test e2e-aws-olm
• /test e2e-gcp
• /test e2e-gcp-upgrade
• /test images
• /test unit
• /test verify

Use /test all to run all jobs.

In response to this:

/test e2e-tests

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[camilamacedo86]

@njhale wdyt about this one? is it ok to be merged? Could you please give a hand with?

[camilamacedo86]

/test e2e-gcp

[camilamacedo86]

/test e2e-aws-olm

[camilamacedo86]

Hi @Bowenislandsong,

I rebased it with the master again to see if the CI issue is fixed.

[camilamacedo86]

/test e2e-gcp
/test e2e-aws-olm

[camilamacedo86]

/retest

[camilamacedo86]

/test e2e-gcp

[openshift-ci-robot]

@camilamacedo86: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/e2e-aws-olm	539c6a7	link	/test e2e-aws-olm
ci/prow/e2e-gcp	539c6a7	link	/test e2e-gcp

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[exdx]

This looks like just a doc PR, so we should go ahead and merge without CI after confirming with the team. Thanks for your contribution.

[exdx]

Merging as this is doc only.