add hint to EPEX Spot Sensor

README.md

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 This component adds electricity prices from stock exchange [EPEX Spot](https://www.epexspot.com) to Home Assistant. [EPEX Spot](https://www.epexspot.com) does not provide free access to the data, so this component uses different ways to retrieve the data.
 
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+January 2024: Hi there, I'm eperimenting with a new feature:
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+https://github.com/mampfes/ha_epex_spot_sensor
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+Please let me know if this is a useful addition to EPEX Spit.
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+---
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 You can choose between multiple sources:
 
 1. Awattar