docs: add new Unity Orb parameters

[EricRibeiro]

Changes

Document the following additions to the Unity Orb:

• return-license: https://github.com/game-ci/unity-orb/pull/29
• no_output_timeout: https://github.com/game-ci/unity-orb/pull/32
• custom_parameter: https://github.com/game-ci/unity-orb/pull/36
• build-method: https://github.com/game-ci/unity-orb/pull/36

Checklist

• [x] Read the contribution guide and accept the code of conduct
• [x] Readme (updated or not needed)
• [x] Tests (added, updated or not needed)

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