Add educational Pluto example

[beorostica]

This pull request is intended to resolve issue #242

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ea2036a) 90.26% compared to head (1625e86) 90.26%.
Report is 28 commits behind head on master.

❗ Current head 1625e86 differs from pull request most recent head de0d315. Consider uploading reports for the commit de0d315 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #253   +/-   ##
=======================================
  Coverage   90.26%   90.26%           
=======================================
  Files          33       33           
  Lines        2291     2291           
=======================================
  Hits         2068     2068           
  Misses        223      223           

Flag	Coverage Δ
core	89.04% <ø> (ø)
io	86.44% <ø> (ø)
komamri	94.09% <ø> (ø)
plots	93.80% <ø> (ø)

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[cncastillo]

The solution looks like this:

[cncastillo]

Change name of folder containing the example to 6.educational_pluto_notebook

[beorostica]

The solution looks like this:

Addressed in ba7b836

[beorostica]

Change name of folder containing the example to 7.educational_pluto_notebook

Addressed in ba7b836