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Update geom/contour/README.md

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+# Contour Plots
+
Demo: <http://bl.ocks.org/4241134>
Computes a contour for a given *grid function* using the [marching squares](http://en.wikipedia.org/wiki/Marching_squares) algorithm. Returns the contour polygon as an array of points. The grid function takes two arguments, *x* and *y*, and returns true if the specified point is inside the contour, and false for points outside the contour. The contour plugin can also take an optional starting point [x, y] on the grid.

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