Add docs about reviewing survey-consent

[becky-gilbert]

We will be flagging responses on the consent ruling and response download pages as having a survey-consent frame (see lookit/lookit-api#1317). We are flagging these because (unlike video consent) the researcher won't be able to see whether the consent is valid without approving it first. Once researchers have access to all of the data from these responses, they should be confirming that the participant actually consented by looking at their responses to the survey-consent questions.

One way to easily see whether the participant has consented is to set up the study in such a way that the participant cannot continue with the study unless they make all of required the survey-consent responses, and redirect any participants who do not consent to a different 'thank you / end study' frame. Then, researchers will be able to see whether or not a participant consented by looking at the frame sequence shown on the response download page.

If there are any responses where the survey-consent frame data does not meet the criteria for consent, the researcher needs to change the consent rulings for these responses from accepted to rejected on the consent ruling page so that the data is not available.

All of this needs to be added to the documentation, so that researchers setting up a study with survey-consent understand CHS expectations and workflows around responses that are consented with survey-consent.