Add statistics

[lisbethmarianne]

I would like to see some statistics (graphs).

For example:

salary by primary technology
salary by gender / gender pay gap
salary by age
...

I think this will involve restricting some of these statistics to one country/city. (One can not mix salaries from e.g. Berlin and San Francisco, the salaries + living costs are just too different.)

Inspiration: https://storage.googleapis.com/js-journal/Berlin-Startup-Salary-Report-Jobspotting-May2016.pdf

[sareg0]

other inspiration:
https://www.citii.io/
http://rhythm-of-food.net/
http://polygraph.cool/
https://fivethirtyeight.com/features/science-isnt-broken/#part1

[berlintam]

sounds great @lisbethmarianne! Would you suggest having a statistics page where you can filter the types of things you are looking for? Or start with a few static graphs?