Adding roadmap section to README

With the transition to Swift-on-File, we are attempting
to provide better guidance to the community as to where the
project is headed.

Signed-off-by: Thiago da Silva <thiago@redhat.com>
fixing a few sentences and adding a new url

Signed-off-by: Thiago da Silva <thiago@redhat.com>
Fixing example to differentiate between Swift and SoF

Signed-off-by: Thiago da Silva <thiago@redhat.com>
Merge pull request #22 from thiagol11/project_roadmap

Project roadmap