Sync with Trello

**Is your feature request related to a problem? Please describe.**
I have some ongoing projects in trello, I want to sync my scope of issues between this local system and trello, so my team can follow my progress.

**Describe the solution you'd like**
Sync switch that synchronizes the local board with trello.

The issue names no files, tests, or entry points, so start by locating the CLI's board and synchronization entry points. Clarify how local tasks map to Trello and whether synchronization is one-way or bidirectional. Done means a defined sync switch reliably keeps the local board and Trello aligned.

Written by the indexing model from the issue text.