Added osmAddress api route

Related to #19

front/src/api/osmAddress/index.ts

@@ -0,0 +1,12 @@
+import { LatLng } from 'leaflet'
+import { OsmAddressResponse } from './types'
+
+const initialOsmAddress = ''
+
+const composeOsmAddressURL = (addressPosition: LatLng) =>
+    `${location.protocol}//nominatim.openstreetmap.org/reverse?format=json&accept-language=ru&lat=${addressPosition.lat}&lon=${addressPosition.lng}`
+
+const processOsmAddress = (data: OsmAddressResponse): string =>
+    data.display_name
+
+export { initialOsmAddress, composeOsmAddressURL, processOsmAddress }

front/src/api/osmAddress/types.ts

@@ -0,0 +1,17 @@
+import { isObject } from '../../utils/types'
+
+type OsmAddressResponse = {
+    display_name: string
+}
+
+const isOsmAddressResponse = (obj: unknown): obj is OsmAddressResponse => isObject(obj, {
+    'display_name': 'string',
+})
+
+export type {
+    OsmAddressResponse,
+}
+
+export {
+    isOsmAddressResponse,
+}