Add container-like data types examples

[slvrtrn]

A follow-up for #128. Related to #116.
Adds examples for:

arr               Array(String),
arr2              Array(Array(String)),
map               Map(String, UInt32),
tuple             Tuple(String, UInt32),
nested            Nested(name String, count UInt32),
point             Point,
ring              Ring,
polygon           Polygon,
multi_polygon     MultiPolygon,
line_string       LineString,
multi_line_string MultiLineString

Geo types are actually supported (noted in the README).