[Charts] DOCSP-4575: Top-level Geospatial chart type page (#138)

Author: steveren

source/chart-type-reference/geo-spatial.txt

@@ -0,0 +1,23 @@
+:noprevnext:
+
+=================
+Geospatial Charts
+=================
+
+.. default-domain:: mongodb
+
+.. contents:: On this page
+   :local:
+   :backlinks: none
+   :depth: 1
+   :class: singlecol
+
+Placeholder description for the Geospatial chart type.
+
+.. class:: hidden
+
+   .. toctree::
+      :titlesonly:
+
+.. sub-pages toc goes here
+