Tutorial on converting a list of addresses to a map.

Vaclav Dekanovsky. "Python's geocoding: Convert a list of addresses into a map". Towards Data Science, 16 July 2020, https://towardsdatascience.com/pythons-geocoding-convert-a-list-of-addresses-into-a-map-f522ef513fd6.

Can't actually run this notebook in a public repo with a real API key because that would expose the key... to the public (always limit key usage, e.g. to specific IP addresses).

Added scripts used in previous geocoding experiments.