Add Guava Knowledge Base plugin

[lukas-frey]

Hey! We couldn't embed the video in your README correctly. Please change it to a raw-HTML markup. It should look something like:

<video width="320" height="240" controls>
  <source src=“RAW-VIDEO-URL-HERE” type="video/mp4">
</video>


Please let us know when you've addressed these issues.

Done

[saade]

Hey! The video is still broken, it looks like the quotes are wrong in your readme file.

[lukas-frey]

fixed