Hydroshare parameter set downloader

I want to easily use a [Hydroshare](https://www.hydroshare.org/) `Model Instance` as a parameter set in the eWaterCycle Python package.

It would nice be if I could so something like

```python
from ewatercycle.pararmeter_sets import download_parameter_sets

pararmeter_set = download_parameter_sets(hydroshare_resource_id='719d896e620c41a59c69519f219d71b8', target_model='summa')
model = ewatercycle.models.Summa(parameter_set)
```
To download https://www.hydroshare.org/resource/719d896e620c41a59c69519f219d71b8/