Links to YouTube videos from repo README.md

[jschumann]

Your (very helpful - thank you!) YouTube videos link to this repo, which is great. It would be nice to have links back to all the videos which have this repo in common, from the repo itself, so we can find them all and follow along in order from the code side of things. Like a playlist or TOC.

Use case: I found this repo from one of the earliest videos, and started looking through the code. The todo service in taskList-end has three options for fetching a user's tasks based on userId. I was left wondering which video discusses the three options. It would be great to be able to jump to the relevant video from the code.