Create release calendar for syncstorage-rs

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One of the follow-ups from this work is to create a regular release calendar. This should include:

1. Assigning release managers (to rotate amongst team members)
2. Clarifying roles for dev/ops at each stage
3. Sharing with dev/ops/qa/product
4. Linking to calendar within ds runbook

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Done. Calendar lives here - I didn't add many details other than to specify the first relman (me) as we can't implement this until a few other pre-reqs are done. Namely:

1618679 - [Ops] - Configure dev env as specified in the environments section above.
1619426 - [Ops] - Configure automated deploys to dev env when PRs merge to master.
1620412 - [Ops] - Configure automated deploys to staging when a new Github release is created.

Once we have a better idea of when to expect those, I'll start adding more details to the release calendar around roles, and share it. It just doesn't make sense to add a lot of dates yet when we don't know details. It also doesn't make sense to share it yet since it's not yet accurate :)