Add document on sprint-kanban based workflow

CONTRIBUTING.md

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+# Team Process
+
+Our team process involves scrum-style practices with some key differences
+
+* We don't have definite sprints.  Our backlog is fluid and re-evaludated every week.
+* We don't story-point.  We should, but we aren't ready to do this yet.
+
+## States
+
+### `Triage`
+
+> Technical contributors: We aren't sure if we should do this, how hard it will be, or if we have enough information.
+
+`Triage` work may be necessary in the indefinite future, but has not been researched.  This is the requirements gathering state.
+
+### `Backlog`
+
+> Technical contributors: We know we can and should do this.  We aren't ready to do it yet.
+
+`Backlog` work has been reviewed (asyncrhonously) by the whole team and deemed to be necessay and adequately understood.
+
+### `Ready`
+
+> Technical contributors: We should do this as soon as we have time.
+
+`Ready` work has been reviewed synchronously by the whole team and accepted for immediate pickup.
+
+### `Done`
+
+> Technical contributors: We did this, and it's merged to main. Please verify that we met the criteria.
+
+`Done` work has been completed by the technical team and requires review from team lead and stakeholders.
+
+## Responsibilities
+
+* Team leads and stakeholders
+  * Can propose new work, which becomes `Triage`
+  * Are solely responsible for maintaining priority in `Triage`.
+  * Help technical team maintain priority in `Backlog`.
+
+* Technical contributors
+  * Can also propose new work, which can become `Backlog` or `Triage` depending on scope.
+  * Are responsible for taking action on high-priority `Triage` work, moving it into the backlog.
+  * Are responsible for gathering additional information or pushing back against `Triage` work.
+
+## Meetings
+
+Our team has a single weekly meeting. The goals of this meeting, in order of priority, are:
+
+1. To verify the correctness of `Ready`
+2. To verify the correctness of `Backlog`, and promote work to `Ready` if appropriate.
+3. To review `Done` and verify that requirements have been met.
+
+## Development
+
+Install https://github.com/Kitware/ldc
+
+```bash
+# copy .env.example and make any changes
+cp .env.example .env
+
+# bring the server up
+ldc up -d
+
+# replace a pre-built image with the development version
+# for example, here's how to work on the girder server code
+ldc dev up girder
+```
+
+To work on the Vue client, see development instructions in `./client`.