[Module]: Explain how to pass license via Casc

[carlosrodlop]

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What is the outcome that you are trying to reach?

The Module comes with Eval licence. The idea is explaining in the README how to pass License via casc

Adding in secrets file

licenseCert: |
  License certificate from CloudBees

licenseKey: |
  License key from CloudBees

Adding in casc

license:
  certificate: ${licenseCert}
  key: ${licenseKey}

Describe the solution you would like

Describe alternatives you have considered

Additional context