split into usage of optional parameters and an example without a restriction, that will run for several days.

enabled execution with additional query parameters

added some error handling when using a cahced endpoint

under development

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