Define interaction for adding relationship type context to a work item[馃帹Design]
馃洃[- Blocked by:-] MVC 1
## Goal
#### :white_check_mark: **Define relationship "types" and flow**
###### 馃敭 **Which types should we include by default?**
- _Idea_: "Child" items that are sub work items nested within the parent (MVC)
- _Idea_: "Checklist items" that can be promoted to "child" items if needed
- _Idea_: "Dependent items" that are blocking or blocked by the current parent
- _Idea_: "Related items" ...- _what are these?_ or:
- _Idea_: "Mentions/callouts" of this parent work item in other objects
#### :white_check_mark: **Define terminology of relationship "types"**
###### 馃敭 **What should we label or title these "child" items?**
- _Idea_: To complete
- _Idea_: Acceptance criteria
- _Idea_: Backlog
- _Idea_: Children
- _Idea_: Sub-tasks
- _Idea_: Child items
- _Idea_: To-Do
- _Something else?_
###### 馃敭 **What should we label or title these "Checklist" items?**
- _Idea_: Checklist items
- _Idea_: Sub-tasks
- _Idea_: To-Dos
- _Something else?_
###### 馃敭 **What should we label or title these "Dependent" items?**
- _Idea_: Dependent items / Dependencies
- _Idea_: Related items
- _Something else?_
###### 馃敭 **What is the entry point for adding "children"? (MVC)**
- _Idea a_: Pick from `Add child` option at top level
- _Idea a_: Pick from `Add child` options within list on slash command
- _Idea b_: Pick from `Add child` option under `Child widget` picker at top level
- _Idea b_: Pick from `Add child` option under `Child widget` that has been added by slash command
- _Idea b_: Pick from `Add child` option within exposed empty state
- _Idea c_: Pick from `Add child` option within "Links" or "To-Do" section picker
- _Idea c_: Pick from `Add child` option within "Links" or "To-Do" section exposed empty state
- _Idea c_: Pick from `Add child` option within `"Links" or "To-Do" widget` that has been added on slash command
- _Future_: All children must be promoted from checklist items
- _Future_: Child widget included in templates
- _Something else?_
## Solution
- [ ] Default relationship types defined: [+Document here+]
- [ ] Relationship types terminology defined: [+Document here+]
- [ ] Entry point or flow: [+Document here+]
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