update readme

readme.md

@@ -2,7 +2,8 @@
 
 A docker compose project to setup an OSM PostGIS database with automatic
 updates from OSM periodically.
-The only file you need is a PBF file and run the docker compose project.
+The only files you need is a PBF file, geojson (if you intent to restrict data download to
+a smaller extent than the one specified by the PBF) and run the docker compose project.
 
 ## General architecture
 
@@ -88,9 +89,9 @@ you to define a smaller area that you can work with.
 This is always desirable to limit the features being imported into the database rather 
 than clipping them.
 
-**NB:** Ensure you add a geojson covering the area you intent to clip into the clip folder.
+**NB:** Ensure you add a geojson covering the area you intent to clip into the settings folder.
 The geojson can be the same extent of the administrative area of your country or it can be a 
-smaller extent
+smaller extent. The CRS of the geojson should always be EPSG:4326.
 
 
 **NB:** It is encouraged to simplify the geometry for the `clip.geojson` as
@@ -244,16 +245,24 @@ With -e, you can add some settings to PostGIS:
 ```bash
  - ALLOW_IP_RANGE= 0.0.0.0/0
 ```
+More environment variables for Kartoza/postgis image can be found from https://github.com/kartoza/docker-postgis#environment-variables
 
-# QGIS Server
+# QGIS Server and Martin Vector tiles
 
-You can run a QGIS Server front end to the OSM mirroir by using the provided
+You can run a QGIS Server front end or martin vector tiles to the OSM mirror by using the provided
 docker-compose-web.yml file. For example:
 
 ```bash
-docker-compose -f docker-compose.yml -f docker-compose-web.yml qgisserver up
+docker-compose -f docker-compose.yml -f docker-compose-web.yml qgisserver  up
 ```
 
+or
+```bash
+docker-compose -f docker-compose.yml -f docker-compose-web.yml martin  up
+```
+For more information about martin configuration and usage can be found from https://github.com/urbica/martin
+
+
 # Credits
 
 This application was designed and implemented by: