Submission of Plinko example (#380)

* Submission of plinko example

The Plinko example showcases the physics behavior and how it along with other tools, like the object shake extension, can create a fun and juicy game.

The example features:
-Physics engine 2.0
-Object shake
-Particles
-Simple scoring system
-Leaderboard
-Text input object(For leaderboard name)

* Optimised images with calibre/image-actions

* Create README.txt

Added the README file

* Update README.txt

* Fixed read me file name? 😅

* Fourth time is the charm. 🤦‍♂️

* Fixing issues from Bouh's suggestions

-Thumbnail is in file folder and now named thumbnail.png
-Changed the package name and game name to Plinko.
-Removed the second thumbnail asset.

* Fixed particle links

After moving everything in to the asset folder it broke the links for the particles, so I had to reset those.

That's fixed now. 😅

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: HelperWesley