[SailfishDevel] Everyone, come on in! SDK now available for Mac and Windows

[David Greaves]

The SDK installers for Mac and Windows are now available at:
  https://sailfishos.org/

This is the same as the Linux version already released.

Thanks to everyone for feedback so far and to the team at Jolla and Digia for
pulling this together.

Download, develop, play - and let us know what you think :)

David