s2: Add CellIndex and associated types.

This is used by Closest/Furthest Cell Query, which is needed for Builder. Updates #59. Signed-off-by: David Symonds <dsymonds@golang.org>
golang · Jul 30, 2020 · 75f8884 · 75f8884
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diff --git a/README.md b/README.md
@@ -161,6 +161,7 @@ listing of the incomplete methods are documented at the end of each file.
 **In Progress** Files that have some work done, but are probably not complete
 enough for general use in production code.
 
+*   CellIndex - A queryable index of CellIDs.
 *   Polygon - Polygons with multiple loops are supported. It fully implements
     Shape and Region, but it's missing most other methods. (Area, Centroid,
     Distance, Projection, Intersection, Union, Contains, Normalized, etc.)