Add robot docs workflow for automated README generation

[Copilot]

Adds missing essentialsplugins-updatereadme-caller.yml workflow to enable automated README documentation updates via the PepperDash robot docs system.

Changes

• Added .github/workflows/essentialsplugins-updatereadme-caller.yml - Triggers README generation on all branch pushes except robot-docs, calls reusable workflow from PepperDash/workflow-templates

Aligns workflow configuration with other PepperDash Essential plugins repositories (e.g., epi-crestron-nvx).

Original prompt

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This section details on the original issue you should resolve

<issue_title>[FEATURE]-Add robot docs workflow</issue_title>
<issue_description>Is your feature request related to a problem? Please describe.
This repo is missing the essentialsplugins-updatereadme-caller.yml workflow from the .github/workflows folder that is present in the https://github.com/PepperDash/epi-crestron-nvx/tree/main/.github/workflows repo.

Describe the solution you'd like
Please copy this file into this repo at the same location

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [FEATURE]-Add robot docs workflow #26

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