Add props bot action workflow

[ernilambar]

Fixes #421

YML file is copied from https://github.com/WordPress/performance/blob/trunk/.github/workflows/props-bot.yml

Since the content of the file is pretty generic, I hope same settings would work for this repo also.

[mukeshpanchal27]

Why the props bot not run on these PR 🤔

[swissspidy]

Maybe have to merge it first?

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[swissspidy]

There we go :-)