Custom Data Examples

[DerekMelchin]

Expected Behavior

All custom data examples use the ObjectStore and have a copy of the data file in the docs repo

Actual Behavior

• This example doesn't even have a working data source.
• The examples under https://www.quantconnect.com/docs/v2/writing-algorithms/importing-data/streaming-data use dropbox, but they should upload the dropbox data to the ObjectStore before reading it. There should also be a copy of this dropbox file in the docs repo so that members can access the data if the dropbox file is no longer accessible.
  • Add a new H3 that discusses uploading the dropbox file to the ObjectStore, stating that it's optional but increases execution speed by not having to download the data every time it runs.

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