SumOfMultiples : add hint to @Ignore annotations

#473

exercises/sum-of-multiples/src/test/java/SumOfMultiplesTest.java

     }
 
     @Test
-    @Ignore
+    @Ignore("Remove to run test")
     public void testSumOfMultiplesOf3and5UpToFour() {
 
         int[] set = {
     }
 
     @Test
-    @Ignore
+    @Ignore("Remove to run test")
     public void testSumOfMultiplesOf3and5UpToTen() {
 
         int[] set = {
     }
 
     @Test
-    @Ignore
+    @Ignore("Remove to run test")
     public void testSumOfMultiplesOf3and5UpToOneHundred() {
 
         int[] set = {
     }
 
     @Test
-    @Ignore
+    @Ignore("Remove to run test")
     public void testSumOfMultiplesOf3and5UpToOneThousand() {
 
         int[] set = {
     }
 
     @Test
-    @Ignore
+    @Ignore("Remove to run test")
     public void testSumOfMultiplesOf7and13and17UpToTwenty() {
 
         int[] set = {
     }
 
     @Test
-    @Ignore
+    @Ignore("Remove to run test")
     public void testSumOfMultiplesOf4and6UpToFifteen() {
 
         int[] set = {
     }
 
     @Test
-    @Ignore
+    @Ignore("Remove to run test")
     public void testSumOfMultiplesOf5and6and8UpToOneHundredFifty() {
 
         int[] set = {
     }
 
     @Test
-    @Ignore
+    @Ignore("Remove to run test")
     public void testSumOfMultiplesOf5and25UpToTwoHundredSeventyFive() {
 
         int[] set = {
     }
 
     @Test
-    @Ignore
+    @Ignore("Remove to run test")
     public void testSumOfMultiplesOf43and47UpToTenThousand() {
 
         int[] set = {
     }
 
     @Test
-    @Ignore
+    @Ignore("Remove to run test")
     public void testSumOfMultiplesOfOneUpToOneHundred() {
 
         int[] set = {
     }
 
     @Test
-    @Ignore
+    @Ignore("Remove to run test")
     public void testSumOfMultiplesOfNoneUpToTenThousand() {
 
         int[] set = {};