Added controllers description

restservice/src/main/java/com/plannaplan/controllers/AssignmentsController.java

@@ -4,6 +4,8 @@ import org.springframework.web.bind.annotation.CrossOrigin;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;
 
+import io.swagger.annotations.Api;
+
 import java.util.List;
 import java.util.Optional;
 
@@ -24,6 +26,8 @@ import org.springframework.web.bind.annotation.RequestMapping;
 @RestController
 @CrossOrigin
 @RequestMapping("/api/" + App.API_VERSION + "/assignments")
+@Api(tags = {
+        "Assignments" }, value = "Assignments", description = "Assignment is representation of student willing to join given group (lecture or calss)")
 public class AssignmentsController extends TokenBasedController {
 
     @Autowired