Docker compose sample and documentation

[cmbTea]

Hi there, I added an example for using the netatmo-exporter in Docker and documented it step by step

[xperimental]

Thanks for your contribution, @cmbTea . It looks like you have invested a lot of time with the description of the example. I have not yet gotten to reading it completely.

I tend to give "as small as possible" examples instead of providing a complete example configuration as there are usually too many moving parts involved and, in the end, every configuration differs a bit.

From what I can see, you have tried to reduce the variance as much as possible, for example by pre-defining IP-adresses. 👍

On the other hand, there are un-necessary steps in the example, for example the watchtower container.

I think I need to take another pass at this. ⌛