Add written process for invoking a retrospective process in Trilinos
Created by: maherou
For issues such as #594 we want to create a follow-on issue such as #632 to record a retrospective that can be used to improve development processes in the future.
We should add a write-up to the Trilinos wiki describing this process:
- Criteria for when a retrospective is useful.
- Use of the retrospective label.
- Format of retrospective.
- Location of the retrospective content.