feat/nominatim-docker_docs: add docs on nominatim install

docs/docker/nominatim/.env.example

@@ -0,0 +1,7 @@
+
+NOMINATIM_PASSWORD=CeMA4M1kiDo0k
+
+# Choose PBF_PATH to import a local file
+PBF_PATH=/nominatim/data/default.osm.pbf
+# PBF_URL= https://download.geofabrik.de/europe/italy/nord-est-latest.osm.pbf
+# REPLICATION_URL= https://download.geofabrik.de/europe/italy/nord-est-updates/

docs/docker/nominatim/docker-compose.yml

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+version: '3'
+
+services:
+  nominatim:
+    container_name: nominatim
+    image: mediagis/nominatim:4.2
+    restart: always
+    ports:
+        - "8080:8080"
+    environment:
+        # see https://github.com/mediagis/nominatim-docker/tree/master/4.2#configuration for more options
+        PBF_PATH: "${PBF_PATH}"
+        PBF_URL: "${PBF_URL}"
+        REPLICATION_URL: "${REPLICATION_URL}"
+        NOMINATIM_PASSWORD: ${NOMINATIM_PASSWORD}
+    volumes:
+        - ./nominatim-data:/var/lib/postgresql/14/main
+        - ./nominatim/data/"${PBF_PATH}":/nominatim/data/"${PBF_PATH}"
+    shm_size: 1gb