Describe usage of the server backend.

README.md

@@ -29,6 +29,22 @@
 
 ## **Task B: application development**
 
+### Application usage
+
+#### Java server backend  
+
+* Running the application with Maven's Tomcat plugin:  
+  `mvn tomcat7:run`
+* Building the application WAR file:  
+  `mvn package`
+* Testing the application:
+  * Unit tests:  
+    ``mvn test``
+  * Integration tests:
+    ``mvn integration-test``  
+    (will also run unit tests in the process)
+
+
 ### _Software libraries selected_
 
 #### JavaScript client frontend