Getting started via our README doesn't point people to dotguides

[sethladd]

our dotguides support is top notch. We should tell people to install it so they can get an awesome coding experience. We should tell them to use it in the README and probably the website docs. But we can start with this README.

it should tell people that are using coding agents:

• they'll have a better time if they install dotguides
• it's easy to do so, here: copy these commands
• there is no step three

[sethladd]

cc @redbrogdon would you be willing to add a blurb into the README?