Update README.md

[AJediIAm]

Added a few good channels with up-to-date guide for getting started and intermediate use. Updated some channels to human readable URL and channel description provided by the channel's about section.

Describe the proposed change

Describe the change and rationale behind them. In case of a new link be, please describe what the link provides and why it is awesome!

The link

Add the link here.

The annoying "I agree" thing

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[AJediIAm]

I'm not very familiar with git. Do you require anything else?

[yayadrian]

@frenck still a valid update. Youtube channels are still home assistant focused.