(proposal) Reflect configuration defaults in readme #46

The configuration section in README.md does not show the defaults, but rather some other values. It's often wise to combine the two things: showing defaults and showing config structure. What can be done with regard to this matter:

1. Values can be replaced with the default ones. This should be mentioned in the text, something like "here are the defaults that you can replace".
2. Non-default values can be kept, comments with defaults can be added.