Get all categories

{ categories:
   [ { id: 83,
       name: 'Test 1',
       description: 'Test description',
       is_income: false,
       exclude_from_budget: true,
       exclude_from_totals: false,
       updated_at: '2020-01-28T09:49:03.225Z',
       created_at: '2020-01-28T09:49:03.225Z',
       is_group: true,
       group_id: null, },
     { id: 84,
       name: 'Test 2',
       description: null,
       is_income: true,
       exclude_from_budget: false,
       exclude_from_totals: true,
       updated_at: '2020-01-28T09:49:03.238Z',
       created_at: '2020-01-28T09:49:03.238Z',
       is_group: false,
       group_id: 83, } ] }