Add GeoSpatial backends for geocoding

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

Geospatial Backend

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/service/geospatial/geospatial.ex

@@ -0,0 +1,15 @@
+defmodule Mobilizon.Service.Geospatial do
+  @moduledoc """
+  Module to load the service adapter defined inside the configuration
+
+  See `Mobilizon.Service.Geospatial.Provider`
+  """
+
+  @doc """
+  Returns the appropriate service adapter
+
+  According to the config behind `config :mobilizon, Mobilizon.Service.Geospatial, service: Mobilizon.Service.Geospatial.Module`
+  """
+  @spec service() :: module()
+  def service(), do: Application.get_env(:mobilizon, __MODULE__) |> get_in([:service])
+end