Add new documentation for prototypes
Initial commit for proto-2013-01
Add header field to proto-2013-01
Update header fields in proto-2013-01
Update proto-2013-01/field-guide-jsonseries.md

Added introduction about SDMX
Update proto-2013-01/field-guide-jsonseries.md

Removed the mandatory element from the attributes as it could bring confusion (attributes defined as mandatory in a DSD do not necessarily need to be present in a data message, for example when revisions are sent and the attributes have not been revised)
Update proto-2013-01/field-guide-jsonseries.md

Order should be optional, as there might not always be a preferred order that differs from the order in which the codes are already displayed in the data message.
Update proto-2013-01/field-guide-jsonseries.md

o Removed reference to groups, the proposal being that attributes attached at the group level can also simply be attached at the series level.
o Added a reference to the possibility of having a flat view of observations (neither time series, nor cross-section)
Update proto-2013-01/field-guide-jsonseries.md

Removed the code index, as it is redundant.
Update proto-2013-01/field-guide-jsonseries.md

Replaced component type by component role
Add support for multiple datasets and fix missing fields for codes
Update proto-2013-01/field-guide-jsonseries.md

o Added DataSet object
o Reorganised information between dataset and header
Update proto-2013-01/field-guide-jsonseries.md

Added a sentence about the order of elements when streaming large data messages
Update proto-2013-01/field-guide-jsonseries.md

Minor editorial changes
Update proto-2013-01/field-guide-jsonseries.md

All header elements are optional.
Update proto-2013-01/field-guide-jsonseries.md

Minor editing
Update proto-2013-01/field-guide-jsonseries.md

Fixed alignment issue
Update proto-2013-01/field-guide-jsonseries.md

Minor editorial changes
Update proto-2013-01/field-guide-jsonseries.md

Minor editorial changes
Update proto-2013-01/field-guide-jsonseries.md

Made 3 fields in the header mandatory