Add Roadmap

Roadmap.md

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+### Priority
+
+- list should only show future shifts
+- list should show better if shifts are taken or not
+- subscribe with reaction
+- unsubscribe with reaction
+
+### Deployment
+
+- Verify via recovery key
+- CLI params via env
+- Dockerfile
+- CI build
+- deploy on interhack camp infra
+
+### Next
+
+- long polling and reminders
+- list with filters
+- make some fields optional when adding custom shifts
+- refacto grist module