Create a data model for accessibility information

[Bertware]

Is your feature request related to a problem? Please describe.
Create a simple data model for accessibility

Describe the feature you'd like

Create a data model containing the following fields:

• Building name
• Building address
• Building type
• Accessibility details (nested object?)

Accessibility details should contain the following information:

• Front door width
• Threshold height
• Accessible toilet?
• Stairs or not
• Elevator or not

Describe alternatives you've considered
Detailed information and chain of accessibility is for later: #10 #11

[DendauwBrian]

Waiting for a linked open data file

[DendauwBrian]

Importing ldfetch gives an error to json-ld:
./node_modules/jsonld/lib/jsonld.js
Module parse failed: Unexpected token (1040:2)
You may need an appropriate loader to handle this file type.
| function _setDefaults(options, {
| documentLoader = jsonld.documentLoader,
| ...defaults
| }) {
| if(typeof options === 'function') {