Consume Backtest Data in Excel Example

[AlexCatarino]

Expected Behavior

We provide an example of converting the backtest results JSON to CSV files and loading them into Excel.

Actual Behavior

We don't have this practical example.

Checklist

• [x] I have completely filled out this template
• [x] I have confirmed that this issue exists on the current master branch
• [x] I have confirmed that this is not a duplicate issue by searching issues