adding Threat Model and corresponding md file

[rnapoles-rh]

What type of PR is this:
/kind documentation

What does this PR do / why we need it:
Save the Threat Model (defined in json format), and basic documentation with important links

Which issue(s) this PR fixes:

Fixes #5794

PR acceptance criteria:

• Unit test

• Integration test

• Documentation

How to test changes / Special notes to the reviewer:
No tests required

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
13 Code Smells

No Coverage information
0.8% Duplication

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[feloy]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: feloy

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[dharmit]

/lgtm

[feloy]

/override ci/prow/v4.10-integration-e2e
/override ci/prow/unit

[openshift-ci]

@feloy: Overrode contexts on behalf of feloy: ci/prow/unit, ci/prow/v4.10-integration-e2e

In response to this:

/override ci/prow/v4.10-integration-e2e
/override ci/prow/unit

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