add 'support us' page

[smaria]

We should have a clear call on our webpage: How to support us, why to support us.

[smaria]

I went ahead and created a page: https://sailrobot.wordpress.com/support-us/

Still looking for a nice picture for the bottom of the page and a good title - the 'our supporters' and then 'support us' looks a bit weird in the head of the title page

[tsaoyu]

Can we add name of 2016 sponsors on our new website?