Add license scan report and status

[fossabot]

Your FOSSA integration was successful! Attached in this PR is a badge and license report to track scan status in your README.

Below are docs for integrating FOSSA license checks into your CI:

• CircleCI
• TravisCI
• Jenkins
• Other

[linux-foundation-easycla[bot]]

• :x: - login: @fossabot / name: fossabot . The commit (0d94e10155437af2787c6a193e09195586848269) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: fossabot Once this PR has been reviewed and has the lgtm label, please assign houshengbo for approval. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files: - **[OWNERS](https://github.com/knative/operator/blob/main/OWNERS)** Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[knative-prow[bot]]

Welcome @fossabot! It looks like this is your first PR to knative/operator 🎉

[knative-prow[bot]]

Hi @fossabot. Thanks for your PR.

I'm waiting for a knative 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 66.21%. Comparing base (f32bc7c) to head (0d94e10). Report is 35 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1798 +/- ## ========================================== + Coverage 63.54% 66.21% +2.67% ========================================== Files 53 53 Lines 2584 2081 -503 ========================================== - Hits 1642 1378 -264 + Misses 827 588 -239 Partials 115 115 ```

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