feature for adding youtube videos

[MrGreensWorkshop]

Is your feature request related to a problem? Please describe.

feature for adding youtube videos by id

Describe the solution you'd like

YouTube video url : https://www.youtube.com/embed/nkZOOK4wM28
YouTube link:       https://www.youtube.com/embed/
VideoID :           nkZOOK4wM28

• add videos using video links

{% include default/youtube-video.html link='nkZOOK4wM28' center=false %}

• youtube video config will be set in _data/conf/main.yml file

youtube:
  privacy: false
  default_center: true

• if center is not provided to include, default_center setting in _data/conf/main.yml will be used.
• if privacy set true www.youtube-nocookie.com will be used.
  otherwise www.youtube.com will be used for youtube video links.

Describe alternatives you've considered

Additional context

[MrGreensWorkshop]

feature adding in PR #53