Add support for Tokyo metro(s)

[XVilka]

Acknowledgments

• The feature I want to propose would be useful for the majority of users, not only for me personally.
• I am aware that Transportr is mostly developed by one person in their unpaid spare time.
• I can help myself to get this feature implemented or know someone who wants to do it.
• If I want to add support for a new region or country, I checked that this is already available in public-transport-enabler and know the process described on the Transportr homepage.

Is your feature request related to a problem? Please describe.
Support Tokyo metro routing.

Describe the solution you'd like
There is open data available at https://github.com/Jugendhackt/tokyo-metro-data