Update README.md

Explained the pre-built WAR file more exhaustively

Author: fabiopavesi

README.md

@@ -1,22 +1,40 @@
 # EDI-NG_server
 This is the server side for [SP7-Ritmare/EDI-NG_client](https://github.com/SP7-Ritmare/EDI-NG_client).
 
-It's a [Spring](http://spring.io) Boot application configured to package as a WAR file, so as to allow deployment to, e.g., [Tomcat](http://tomcat.apache.org).
+It's a [Spring](http://spring.io) Boot application configured to package as a WAR file, so as to allow deployment to, e.g., [Tomcat](http://tomcat.apache.org), relying on a [PostgreSQL](https://www.postgresql.org) database server.
 In order to deploy to Tomcat, you need to place the WAR file in Tomcat's webapps directory, or upload it via the Tomcat manager application.
 
-[Binary WAR file](https://github.com/SP7-Ritmare/EDI-NG_server/releases/download/v1.0/edi.war) is available via the "releases" tab.
+A [Binary WAR file](https://github.com/SP7-Ritmare/EDI-NG_server/releases/download/v1.0/edi.war) is available via the "releases" tab.
 The WAR has been tested on Tomcat 7.
 
-> You will probably not need the pre-packaged WAR, anyway, because it points to our own installation of the PostgreSQL database.
-> You should edit your copy (https://github.com/SP7-Ritmare/EDI-NG_server/blob/master/EDI-T/src/main/resources/application.properties) file and change the spring.datasource.* entries to point to your own PostgreSQL installation.
-> **Warning**: deploying the WAR file will create all necessary tables, but it WILL NOT create the database.
+> The pre-packaged WAR file can be a good starting point to test the system in a reasonably "standalone" mode.
 
+> It contains a built-in version of EDI-NG_client where the templates point to the EDI-NG_server packaged within, with the following pre-requisites:
+> * Tomcat should run on port 8080
+> * PostgreSQL must be installed on a host reachable from your Tomcat machine
+> * An empty database must be created in the PostgreSQL server
+> * Once deployed, you'll need to change the application.war file, present in your Tomcat host's $TOMCAT_HOME/webapps/edi/WEB-INF/classes/ directory, and then restart Tomcat
+>
+
+Following is an example of the configuration you need to edit in $TOMCAT_HOME/webapps/edi/WEB-INF/classes/application.properties 
+```properties
+spring.datasource.url=jdbc:postgresql://<your PostreSQL host>/<db name you picked>
+spring.datasource.username=<username>
+spring.datasource.password=<password>
+spring.datasource.driverClassName=org.postgresql.Driver
+```
+
+Once all prerequisites are met, you can test the EDI-NG_client and server by pointing your browser to http://localhost:8080/ on your Tomcat machine.
+
+## Building your own WAR file
 If you want to build the latest release from sources, you can user [Apache Maven](https://maven.apache.org/index.html) (Apache License v2.0). In the EDI-T directory, simply run:
 ```bash
 mvn package
 ```
 This will create your WAR file in the target directory, ready for deployment.
 
+Prior to create the WAR file you might want to customise the application.properties file, mentioned above, so as to match your PostgreSQL location.
+
 # Dependencies
 All dependencies are listed in the *pom.xml* file.