document __init__loadsave

[JonasIsensee]

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I was struggling with the error messages from save("test.stl", r) and found your __init__loadsave function that works like a charm. While this is somewhat of a dirty trick, It'd be good to mention it somewhere in the docs. Also: it's been sitting on master for 5 months without a release ;)

https://github.com/plut/ConstructiveGeometry.jl/blob/1205666a10030816f615c2d72954af49af9add2d/src/ConstructiveGeometry.jl#L2010

[plut]

I wrote a short paragraph on this topic, it should be online within a few minutes.

(Sorry for the late reply — this package is a hobby project and I don't always have as much time as I would want for it).