posts: bloom-filter: add presentation
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[wiki]: https://en.wikipedia.org/wiki/Bloom_filter
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<!--more-->
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## What does it do?
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A _Bloom Filter_ can be understood as a hash-set which can either tell you:
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* An element is _not_ part of the set.
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* An element _may be_ part of the set.
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More specifically, one can tweak the parameters of the filter to make it so that
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the _false positive_ rate of membership is quite low.
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I won't be going into those calculations here, but they are quite trivial to
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compute, or one can just look up appropriate values for their use case.
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