fill in readme and added docker compose file

README.md

@@ -1,6 +1,17 @@
+## Wildfly application server with PostgreSQL database driver
 
-docker build -t tonda100/wildfly-postgresql .
+This image contains Wildfly 10.1 server with PostgreSQL database driver. The project inherits from [tonda100/wildfly-empty](https://github.com/tonda100/wildfly-empty) project. At the build time or start you have to setup these enviroment variables
+* DB_HOST - hostname or IP address of database
+* DB_PORT - port of database
+* DB_NAME - name of the database
+* DB_USER - username used for connection to database
+* DB_PASS - password user for connection to database
+The connection string is then created as `jdbc:postgresql://$DB_HOST:$DB_PORT/$DB_NAME` more details see [startWithPostgres.sh](https://github.com/tonda100/wildfly-postgresql/blob/master/startWithPostgres.sh)
 
-docker run -d --name postgres -p 5432:5432 --net=wildfly -e POSTGRES_USER=myapp -e POSTGRES_PASSWORD=my-password postgres:9.6.1
+### Test
+Project can be tested with separate containers or via docker-compose.
+`docker network create wildfly`
+`docker run -d --name postgres -p 5432:5432 --net=wildfly -e POSTGRES_USER=myapp -e POSTGRES_PASSWORD=my-password postgres:9.6.1`
+`docker run -d --name wildfly -p 8080:8080 --net=wildfly -e DB_HOST=postgres -e DB_NAME=myapp -e DB_USER=myapp -e DB_PASS=my-password tonda100/wildfly-postgresql`
 
-docker run -d --name wildfly -p 8080:8080 --net=wildfly -e DB_HOST=postgres -e DB_USER=myapp -e DB_USER=myapp -e DB_PASS=my-password tonda100/wildfly-postgresql
+Project is available on [GitHub](https://github.com/tonda100/wildfly-postgresql)

docker-compose.yml

@@ -0,0 +1,20 @@
+version: '2'
+services:
+    postgres:
+        image: postgres:9.6.1
+        ports:
+            - "5432:5432"
+        environment:
+            - POSTGRES_USER=myapp
+            - POSTGRES_PASSWORD=my-password
+    wildfly:
+        image: tonda100/wildfly-postgresql
+        ports:
+            - "8080:8080"
+        environment:
+            - DB_HOST=postgres
+            - DB_NAME=myapp
+            - DB_USER=myapp
+            - DB_PASS=my-password
+        depends_on:
+            - postgres