robot-simulator: add hints to @Ignore annotations

exercises/robot-simulator/src/test/java/RobotTest.java

         assertTrue(robot.getGridPosition().equals(initialGridPosition));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testRobotIsCreatedWithCorrectInitialOrientation() {
         final Orientation initialOrientation = Orientation.NORTH;
         assertTrue(robot.getOrientation().equals(initialOrientation));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testTurningRightDoesNotChangePosition() {
         final GridPosition initialGridPosition = new GridPosition(0, 0);
         assertTrue(robot.getGridPosition().equals(initialGridPosition));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testTurningRightCorrectlyChangesOrientationFromNorthToEast() {
         final Robot robot = new Robot(new GridPosition(0, 0), Orientation.NORTH);
         assertTrue(robot.getOrientation().equals(expectedOrientation));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testTurningRightCorrectlyChangesOrientationFromEastToSouth() {
         final Robot robot = new Robot(new GridPosition(0, 0), Orientation.EAST);
         assertTrue(robot.getOrientation().equals(expectedOrientation));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testTurningRightCorrectlyChangesOrientationFromSouthToWest() {
         final Robot robot = new Robot(new GridPosition(0, 0), Orientation.SOUTH);
         assertTrue(robot.getOrientation().equals(expectedOrientation));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testTurningRightCorrectlyChangesOrientationFromWestToNorth() {
         final Robot robot = new Robot(new GridPosition(0, 0), Orientation.WEST);
         assertTrue(robot.getOrientation().equals(expectedOrientation));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testTurningLeftDoesNotChangePosition() {
         final GridPosition initialGridPosition = new GridPosition(0, 0);
         assertTrue(robot.getGridPosition().equals(initialGridPosition));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testTurningLeftCorrectlyChangesOrientationFromNorthToWest() {
         final Robot robot = new Robot(new GridPosition(0, 0), Orientation.NORTH);
         assertTrue(robot.getOrientation().equals(expectedOrientation));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testTurningLeftCorrectlyChangesOrientationFromWestToSouth() {
         final Robot robot = new Robot(new GridPosition(0, 0), Orientation.WEST);
         assertTrue(robot.getOrientation().equals(expectedOrientation));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testTurningLeftCorrectlyChangesOrientationFromSouthToEast() {
         final Robot robot = new Robot(new GridPosition(0, 0), Orientation.SOUTH);
         assertTrue(robot.getOrientation().equals(expectedOrientation));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testTurningLeftCorrectlyChangesOrientationFromEastToNorth() {
         final Robot robot = new Robot(new GridPosition(0, 0), Orientation.EAST);
         assertTrue(robot.getOrientation().equals(expectedOrientation));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testAdvancingDoesNotChangeOrientation() {
         final Orientation initialOrientation = Orientation.NORTH;
         assertTrue(robot.getOrientation().equals(initialOrientation));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testAdvancingWhenFacingNorthIncreasesYCoordinateByOne() {
         final Robot robot = new Robot(new GridPosition(0, 0), Orientation.NORTH);
         assertTrue(robot.getGridPosition().equals(expectedGridPosition));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testAdvancingWhenFacingSouthDecreasesYCoordinateByOne() {
         final Robot robot = new Robot(new GridPosition(0, 0), Orientation.SOUTH);
         assertTrue(robot.getGridPosition().equals(expectedGridPosition));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testAdvancingWhenFacingEastIncreasesXCoordinateByOne() {
         final Robot robot = new Robot(new GridPosition(0, 0), Orientation.EAST);
         assertTrue(robot.getGridPosition().equals(expectedGridPosition));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testAdvancingWhenFacingWestDecreasesXCoordinateByOne() {
         final Robot robot = new Robot(new GridPosition(0, 0), Orientation.WEST);
         assertTrue(robot.getGridPosition().equals(expectedGridPosition));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testInstructionsToMoveWestAndNorth() {
         final Robot robot = new Robot(new GridPosition(0, 0), Orientation.NORTH);
         assertTrue(robot.getOrientation().equals(expectedOrientation));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testInstructionsToMoveWestAndSouth() {
         final Robot robot = new Robot(new GridPosition(2, -7), Orientation.EAST);
         assertTrue(robot.getOrientation().equals(expectedOrientation));
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void testInstructionsToMoveEastAndNorth() {
         final Robot robot = new Robot(new GridPosition(8, 4), Orientation.SOUTH);