README initialization

README.md

@@ -21,12 +21,24 @@ A client named `usagecontrol` and with the `citizen` role within the realm to be
 
 
 ## Installation
+### Get the code
 Clone this repository:
 
 ``` bash
 git clone https://git.code.tecnalia.com/across/public/citizen-data-ownership-and-usage-control/usage-control/Usagecontrol.git
 ```
 
+### Configure properties files
+Check the following `*.env` files and change the property values as required:
+- `./postgres.env`: this file contains the properties related to the PostgreSQL DB, as the username and password, to be used for creating the DB container.
+- `./datausage.env`: this file contains properties to be used when creating the UsageControl container and related to:
+  - the information required to connect to the PostgreSQL DB.
+  - Some URL-s of the Identity Server (keycloak) to connect to, and information related to the clients and realm to use.
+  - The main URL of the Service Catalogue HTTP API.
+  - The main URL of the TD HTTP API.
+  - The URL of the PIP endpoint to get the number of times accessed a specific service, and to be used when doing the enforcement of the "N times usage" policy.
+
+### Start containers
 Create and start the containers specified in the docker-compose.yml file:
 
 ``` bash