Create DocumentType Model and DB-APIs

param	Type	options
name	String	`required`
icon	String	`required`
description	String	`required`
fields	Object	`required`

For now we will be making the field fields an Object field for now, for saving the JSON of a schema.

{
  "$id": "https://example.com/person.schema.json",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Person",
  "type": "object",
  "properties": {
    "firstName": {
      "type": "string",
      "description": "The person's first name."
    },
    "lastName": {
      "type": "string",
      "description": "The person's last name."
    },
    "age": {
      "description": "Age in years which must be equal to or greater than zero.",
      "type": "integer",
      "minimum": 0
    }
  }
}

Also, every update of this will mean in a new version of this document type So we will have to use the plugin for versioning. Here is the repo. Install it as a dependence. https://github.com/saintedlama/mongoose-version

Also we need to create the following db-api methods for DocumentType

Method	Description	Returns
`DocumentType.create()`	Creates the document type	The created documentType
`DocumentType.update( {id, documentType } )`	Updates a document type	The updated documentType
`DocumentType.get(id)`	Gets the document type	The documentType with the `id`
`DocumentType.list(id)`	Lists the document type	A list with the paginator fields and a list of document types
`DocumentType.delete(id)`	Deletes the document type	Nothing

DemocracyOS / core

Create DocumentType Model and DB-APIs #18