Custom_components weather_data, replacing depricated YR.no - Component not found?

Hi 

I am trying to use custom_components to replace YR weather sensor, that is no longer working.

I have placed the 3 files from github in:
.homeassistant/custom_components/weather_data/.

and changed the sensor - platform to weather_data

But the custom components is not being found, why ?????

This is my first use of custom_components. Do I need to set any reference to the newly created custom_components directory ?

I also created a link from default sensor.py to weather_data.py

ln -s sensor.py weather_data.py
 

https://github.com/Danielhiversen/home_assistant_weather_data/tree/master/custom_components/weather_data

My HA is python env installation, version 0.81.4

Any suggestions here, please...