Determining where to focus content efforts

Following on from [@nelsonic's suggestion](https://github.com/dwyl/video/issues/17#issuecomment-275573939) that we start off our content by creating a 5 minute introductory video for each of our tutorials, I think it would be great if we could use this as a gauge of interest to see where we should focus our efforts in terms of content.

@nelsonic and I have discussed ending the video with a request for people to subscribe to the channel if they are interested in more videos but leaving a comment if they would like to see more videos along a similar vein.

Start by reviewing the linked discussion in issue 17 and the proposal here for five-minute introductory videos for tutorials. The issue mentions using subscriptions and comments to gauge interest, but names no files, tests, or implementation entry points; done would require an agreed content plan and measurement approach.

Written by the indexing model from the issue text.