toar_rest_client: continued work on error handling.

enabled execution with additional query parameters

uncommented some debug output
update to dropping of timestamps that is required for some datasets...

added some error handling when using a cahced endpoint

under development

- added info to statistics applied during request to TOAR-DB

metadata:
- first round of documentation

added first documentation to classes and their methods

started documentation as example

fixed some typos.

added comments to produce_data example

- fixed bug in plotting of station positions

README.md
- started rework of documentation of examples

.gitignore added directory used for examples

made adoptions to the updates by Simon

- added creation of subdiretories
- added some output

Create a basic structure and added the first content