Add docs

plume-test/README.md

@@ -7,3 +7,20 @@ Included dependencies:
 - Test assertions done in a fluent and more readable way: [Assertj](https://github.com/assertj/assertj)
 - To create quick mocks: [Mockito](https://github.com/mockito/mockito)
 - Integration tests with Guice: [Guice-junit](https://github.com/Coreoz/Guice-Junit)
+
+Sample usage of `MockedClock` with Guice to create a test module that overrides the default `Clock`: 
+```java
+public class TestModule extends AbstractModule {
+	@Override
+	protected void configure() {
+		install(Modules.override(new ApplicationModule()).with(new AbstractModule() {
+			@Override
+			protected void configure() {
+				bind(Clock.class).to(MockedClock.class);
+			}
+		}));
+	}
+}
+```
+
+This module can then be used with the `@GuiceTest` annotation. See [Guice JUnit documentation](https://github.com/Coreoz/Guice-Junit#getting-started) for details.