Add 1.7 release timeline (#573)
Add 1.7 release timeline (#573)

* Add 1.7 release timeline

Commit with initial timeline proposal.

* Move Feature Freeze date by 1 week

Move Feature Freeze data by 1 week due to holidays.

* Update Roadmap finalization date

After the last communtiy meeting we agreed to push the Roadmap
finalization date to October 19th to give WGs more time and for the
roadmaps being presented during Kubeflow Summit.
kubeflow/community,kubeflow/community,kubeflow/community,kubeflow/community