Add FD Specification compliance statement

[Stephen-Gates]

Desired Behaviour

document what parts of the specification Data Curator implements

• tabular data package and resources
• data package version
• foreign keys across data packages
• ...

see frictionlessdata/software-legacy#26

[Stephen-Gates]

Data Curator implements:

• Data Package (partial)
  • only Tabular Data Packages are supported
  • cannot add the following properties mainly because Data Curator packages data locally so they don't make sense. Download an existing data package with these properties and they will be lost. Perhaps we should support the properties but not allow editing Store unsupported properties if downloaded in an existing data package #419?
    • homepage
    • image
    • keywords
    • created
• Data Resource (partial)
  • only Tabular Data Resources are supported
  • cannot add properties:
    • data - in-line data
    • path - data at a url or in multiple files
    • bytes - planned Generate bytes entry for table properties  #370
    • hash
    • schema at url
    • CSV dialect at a url
    • JSON tabular data
• Table Schema
• CSV Dialect, support for:
  • "delimiter": ,, ;, or /t
  • "header": true
  • "caseSensitiveHeader": true or false
• Data Package Version pattern (potential improvements On Export, check data package version has been incremented #418)
• Table Schema: Foreign Keys to Data Packages pattern
• Data Package Views are not supported