Add Galton Board example

[EnzioKam]

PR Checklist

If you are contributing to Javis.jl, please make sure you are able to check off each item on this list:

• Did I update CHANGELOG.md with whatever changes/features I added with this PR?
• Did I make sure to only change the part of the file where I introduced a new change/feature?
• Did I cover all corner cases to be close to 100% test coverage (if applicable)?
• Did I properly add Javis dependencies to the Project.toml + set an upper bound of the dependency (if applicable)?
• Did I properly add test dependencies to the test directory (if applicable)?
• Did I check relevant tutorials that may be affected by changes in this PR?
• Did I clearly articulate why this PR was made the way it was and how it was made?

Link to relevant issue(s)

How did you address these issues with this PR? What methods did you use?
Adds the Galton Board example to the Examples page in the documentation.

[TheCedarPrince]

Hi @EnzioKam - thanks for the great PR! I think we are set to merge. I'll ping @Wikunia for a quick review but otherwise, this looks fantastic! The code is quite interesting - much smaller than I anticipated frankly and your documentation is stellar.

Ole, feel free to merge if it looks good to you!

[codecov]

Codecov Report

Merging #397 (8155795) into master (4c17cc7) will not change coverage.
The diff coverage is n/a.

❗ Current head 8155795 differs from pull request most recent head 7279e56. Consider uploading reports for the commit 7279e56 to get more accurate results

@@           Coverage Diff           @@
##           master     #397   +/-   ##
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  Coverage   96.25%   96.25%           
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  Files          35       35           
  Lines        1521     1521           
=======================================
  Hits         1464     1464           
  Misses         57       57           

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[Wikunia]

Some small things. Thanks for the update

[Wikunia]

Thank you 🎉