Add a brief demonstration for visualization with Makie

[Ickaser]

As we discussed in #7 , here is a MWE demonstrating how to make a Meshes.jl mesh from this mesh structure, so it can be visualized with GLMakie. I am happy to move this to a separate file or elsewhere in the README, and can include an image of the output as well.

Fixes #7.

[codecov]

Codecov Report

Merging #8 (4e2c667) into main (93e5581) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main       #8   +/-   ##
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  Coverage   99.77%   99.77%           
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  Files           2        2           
  Lines         436      440    +4     
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+ Hits          435      439    +4     
  Misses          1        1           

Impacted Files	Coverage Δ
src/example.jl	100.00% <100.00%> (ø)

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[t-bltg]

Very nice, thanks. I'll be able to try this in about an hour. I've been able to reproduce this.

can include an image of the output as well.

Good idea. For the inclusion of an example img, you can make a separate PR to the marchingcubes-docs branch and link to it in README.md, as I did for the current paraview image.

EDIT: image PR created in #9.