Hexagonal pattern: Add Guice dependency

hexagonal/pom.xml

@@ -39,5 +39,9 @@
       <artifactId>junit</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>com.google.inject</groupId>
+      <artifactId>guice</artifactId>
+    </dependency>
   </dependencies>
 </project>