Add demo video image and text link #88

[sh4r10]

The README.md file now contains the demo video link information. This closes #88.

:ballot_box_with_check: Definition of Done checklist

• [x] Meaningful title and valuable description in pull request
• [x] Code change tested manually if not covered by automated tests
• [x] Pull request linked to one or more issues/stories
• [x] Acceptance criteria of the linked stories satisfied
• [x] Code change comprehended by those who approved it
• [x] State of target branch maintained or improved after the code change

[adityak714]

@sh4r10 No sorry, do this instead.

<a href="https://www.youtube.com/watch?v=snG1YhIBNhA">
  <img src="https://user-images.githubusercontent.com/21986219/170846174-ac997b38-ebb3-4104-88ca-fe07ea0bfa13.png" width=1100>
</a>

***

[RuthgerD]

Awesome vid :+1: