add the Apache 2.0 LICENSE file to the project

[gregsheremeta]

The opendatahub-operator project has always been licensed under Apache 2.0, but it was missing a license file.

[openshift-ci]

@gregsheremeta: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/opendatahub-manifests-e2e	753f226	link	false	/test opendatahub-manifests-e2e

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[VaishnaviHire]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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