Add the OpenSSF badge to the main README

[afrittoli]

Changes

Fixes: #536

Signed-off-by: Andrea Frittoli andrea.frittoli@gmail.com

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• Has Tests included if any functionality added or changed
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  functionality, content, code)
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Release Notes

NONE

/kind documentation

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[priyawadhwa]

/test pull-tekton-chains-integration-tests

[tekton-robot]

@afrittoli: 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
pull-tekton-chains-integration-tests	1ba2250	link	true	/test pull-tekton-chains-integration-tests

Full PR test history. Your PR dashboard.

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