Add asyncio docs and extend YouTube video text

[TarunRKaushik]

Description

Added references to asynchronous functions, changed description of video series and added a link to the video series in the "create your own skill" section. Basically worked on issue #437

Fixes #437

Status

READY

Type of change

• Documentation (fix or adds documentation)

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

Merging #478 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #478   +/-   ##
======================================
  Coverage    99.9%   99.9%           
======================================
  Files          18      18           
  Lines        1092    1092           
======================================
  Hits         1091    1091           
  Misses          1       1

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[jacobtomlinson]

Great stuff!

Please remove the reference to @asyncio.coroutine as it has been replaced by async def. We do not need to mention the old way of doing things.

[TarunRKaushik]

will do

[jacobtomlinson]

That's great! Also can you mention the await keyword too as it's important when responding to messages.

[TarunRKaushik]

done. anything else?

[jacobtomlinson]

Nope this looks good, I'll merge it now.

[jacobtomlinson]

Ping me your address via DM on Twitter or Gitter and I'll post you some opsdroid stickers!