API endpoint that allows Agencies to be viewed.

GET:
Return a list of all the existing users.

MODE:
Normal and Detailed
/2.2.0/agencies/?mode=detailed

FILTERS:
Parameters - 'featured', 'agency_type', 'country_code'
Example - /2.2.0/agencies/?featured=true

SEARCH EXAMPLE:
/2.2.0/agencies/?search=nasa

ORDERING:
Fields - 'id', 'name', 'featured'
Example - /2.2.0/agencies/?ordering=featured

The 'country_code' field is a string of comma separated ISO 3166 alpha-3 codes.

GET /2.2.0/agencies/142/?format=api
HTTP 200 OK
Allow: GET
Content-Type: application/json
Vary: Accept

{
    "id": 142,
    "url": "https://ll.thespacedevs.com/2.2.0/agencies/142/?format=api",
    "name": "Copenhagen Suborbitals",
    "featured": false,
    "type": "Commercial",
    "country_code": "DNK",
    "abbrev": "CSU",
    "description": "Copenhagen Suborbitals is the world's only manned, amateur, crowd funded space program.  Their stated goal is to have one of the members fly into space (above 100 km), on a sub-orbital spaceflight, in a space capsule on the Spica rocket.As an amateur organisation, the 55 members use their spare time on the project, while at the same time having regular day jobs.",
    "administrator": "Kristian Elof Sørensen",
    "founding_year": "2008",
    "launchers": "",
    "spacecraft": "",
    "parent": null,
    "launch_library_url": null,
    "total_launch_count": 0,
    "successful_launches": 0,
    "consecutive_successful_launches": 0,
    "failed_launches": 0,
    "pending_launches": 0,
    "successful_landings": 0,
    "failed_landings": 0,
    "attempted_landings": 0,
    "consecutive_successful_landings": 0,
    "info_url": "https://twitter.com/CopSub",
    "wiki_url": "http://en.wikipedia.org/wiki/Copenhagen_Suborbitals",
    "logo_url": "https://spacelaunchnow-prod-east.nyc3.digitaloceanspaces.com/media/images/copenhagen2520suborbitals_logo_20190207032433.png",
    "image_url": null,
    "nation_url": null,
    "launcher_list": [],
    "spacecraft_list": []
}