MVP User Stories for Issue/PR Velocity Analytics via GitHub API

### Overview

As a pm at HFLA website, I need to check regularly the velocity of the delivery to adapt the roadmap and make sure that we stay on track.

### Action Items

- [x] Brainstorm with the dev team about the analytics that they would be interested in

Here are the metrics the product team needs:
- [ ] During the recent months, how much time would it take to have an issue closed based on its sizing label and role label.
- [ ] During the recent months, how much time would it take to have an issue move from the prioritized backlog to in progress and then to in progress to closed (based on its sizing label and role label).
- [ ] During the recent months, how much issue have been closed per week and per months
- [ ] How long does it take to review a PR based on the size of the issue

Here are the metrics the dev team needs:
- [ ] Number of pull requests done per month.
- [ ] Time it takes for contributors to pick up new issues after an issue is done and merged

### Resources/Instructions
Don't hesitate to ask the product team for any question regarding this issue
Please put the metrics on a spreadsheet format
[Link to issue data](https://github.com/Aveline-art/team-analytics/blob/prototype/Data%20Analysis%20Issue.ipynb)
[Link to pull request data](https://github.com/Aveline-art/team-analytics/blob/prototype/Data%20Analysis%20PR.ipynb)