Add CNAME file to repository

[lordkada]

We should publish our contest website as section in our main website (e.g. coderdojomilano.it/expo-2015).

(how to do here: https://help.github.com/articles/adding-a-cname-file-to-your-repository/)

[giampiero7]

Let's wait until we have some more content :)

[lordkada]

Yes, I agree... this is just a placeholder ;-)