Update geometry/nearest_points.md, adding a randomized algorithm explanation #1473
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Explanation of randomized algorithms for closest pair of points.
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The new explanation adds two randomized algorithms that are linear (in different ways), one of them being much simpler to implement and remember than the traditional divide and conquer algorithm, and improving its runtime efficiency (the first one probabilistically, the second one in expectancy). An implementation for the first one is provided. An image is included to clarify the strategy of the first randomized algorithm.