new informative page: UnhostedXdi

Hello XDI TC,

Another new informative page:

https://wiki.oasis-open.org/xdi/UnhostedXdi

The idea is to write applications that run inside a web browser and do not require a backend component. Instead, an Unhosted XDI application uses XDI messaging to directly talk to XDI servers to access and store data. I came up with this idea after having followed the Unhosted initiative for a while, I believe it carries a powerful message of user centricity and control over personal data.

Markus