Proposal of a roadmap towards a v1 release

[jenkin]

No fundamental changes in draft spec.

• [ ] rename draft folder to v1
• [ ] update revision from 0.1 to 1.0
• [ ] fix copyright notice (CC0 is public domain, not attribution)
• [ ] remove all default: null (optional attributes can be simply omitted)
• [ ] add examples for all attributes (ie. no "district": null)
• [ ] remove all TODO notices
• [ ] refactor spec text taking inspiration from RFC7946 (GeoJSON spec)
• [ ] build an index.html file from spec md file (served as homepage, ie. using markdown-to-html-cli)
• [ ] add JSON Schema with checksum #24
• [ ] build an interactive page to navigate spec schema (ie. using @stoplight/json-schema-viewer)
• [ ] enable github pages to serve static content
• [ ] add a changelog
• [ ] add a code of conduct
• [ ] add contributing guidelines
• [ ] add a LICENSE file
• [ ] enrich README in root folder
• [ ] define issue templates: proposal, bug, q&a, use case report
• [ ] close all open issues