Add "phenodata" to the "Data Mining" section

[amotl]

Dear @schymans,

thanks for answering us at #14. As I just recognized your profession might be centered around plant-environment interactions, I also just wanted to quickly introduce you to phenodata [1,2], which is also coming from our pen.

It is not that much advanced like Wetterdienst, i.e. it completely lacks any test harness whatsoever. So, it might probably not qualify as "awesome" yet. However, you might still find it useful for your research.

We will be happy to hear back from you about this. As we haven't touched it for a while, we are not sure if anything might be broken. However, if you believe this tool might be useful for the scientific community eventually gathering here, we might try to give it some more love.

With kind regards,
Andreas.

[1] https://github.com/hiveeyes/phenodata
[2] https://community.hiveeyes.org/t/phanologischer-kalender/664

[schymans]

This is great, thanks for the mention! I don't use phenodata myself but will try to hook up with people that do, and find out if there are other phenodata providers that could be coupled with the DWD data.