Add config object documentation

[bee-san]

The config object is used by programmers, it should have documentation on:

• Putting things into the object
• Pulling things out of the object

[issue-label-bot]

Issue-Label Bot is automatically applying the label feature_request to this issue, with a confidence of 0.95. Please mark this comment with 👍 or 👎 to give our bot feedback!

Links: app homepage, dashboard and code for this bot.