Re-record the getting started guide video

[huan]

And update the Blog with the new Youtube link.

[lijiarui]

duplicate with #35

[lijiarui]

Only this one left for a more clear One page wechaty introduction in #35
And tutorial link as follows:

https://v.qq.com/x/page/k0726ho4rce.html

[huan]

The video LGTM, you can use it for the getting started tutorial.

And I'd like to suggest you publish a new Tutorial Blog instead of modifying the old one because the old one can be used for the Wechaty version v0.14 or below.

As the new tutorial is published, you can add a Update message in the old tutorial, link to your new tutorial for Wechaty version 0.18 or above.

[huan]

Close this issue because it is getting to be 1 year old.