Document how to get swap endian for the Buffer class
As the Buffer class currently only supports utf16 in little endian ordering, Buffer cannot be used to read in data from things like OpenType fonts, which by definition are always in big endian ordering, irrespective of the hardware or data reader (see https://www.microsoft.com/typography/OTSpec/otff.htm, "data types", All OpenType fonts use Motorola-style byte ordering (Big Endian)
).
Can Buffer be given a utf16be
to match the already present utf16le
, so that Buffer can be used with all utf16 data, rather than only with data that is in little endian ordering?