crypto-square: add hint to @Ignore annotations

exercises/crypto-square/src/test/java/CryptoSquareTest.java

         assertEquals(expectedOutput, crypto.getNormalizedPlaintext());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void lettersAreLowerCasedDuringNormalization() {
         Crypto crypto = new Crypto("WHOA HEY!");
         assertEquals(expectedOutput, crypto.getNormalizedPlaintext());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void numbersAreKeptDuringNormalization() {
         Crypto crypto = new Crypto("1, 2, 3, GO!");
         assertEquals(expectedOutput, crypto.getNormalizedPlaintext());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void smallestSquareSizeIs2() {
         Crypto crypto = new Crypto("1234");
         assertEquals(expectedOutput, crypto.getSquareSize());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void sizeOfTextWhoseLengthIsPerfectSquareIsItsSquareRoot() {
         Crypto crypto = new Crypto("123456789");
         assertEquals(expectedOutput, crypto.getSquareSize());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void sizeOfTextWhoseLengthIsNoPerfectSquareIsNextBiggestSquareRoot() {
         Crypto crypto = new Crypto("123456789abc");
         assertEquals(expectedOutput, crypto.getSquareSize());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void sizeIsDeterminedByNormalizedText() {
         Crypto crypto = new Crypto("Oh hey, this is nuts!");
         assertEquals(expectedOutput, crypto.getSquareSize());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void segmentsAreSplitBySquareSize() {
         Crypto crypto = new Crypto("Never vex thine heart with idle woes");
         assertEquals(expectedOutput, crypto.getPlaintextSegments());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void segmentsAreSplitBySquareSizeUntilTextRunsOut() {
         Crypto crypto = new Crypto("ZOMG! ZOMBIES!!!");
         assertEquals(expectedOutput, crypto.getPlaintextSegments());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void cipherTextCombinesTextByColumn() {
         Crypto crypto = new Crypto("First, solve the problem. Then, write the code.");
         assertEquals(expectedOutput, crypto.getCipherText());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void cipherTextSkipsCellsWithNoText() {
         Crypto crypto = new Crypto("Time is an illusion. Lunchtime doubly so.");
         assertEquals(expectedOutput, crypto.getCipherText());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void normalizedCipherTextIsSplitByHeightOfSquare() {
         Crypto crypto = new Crypto("Vampires are people too!");
         assertEquals(expectedOutput, crypto.getNormalizedCipherText());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void normalizedCipherNotExactlyDivisibleBy5SpillsIntoSmallerSegment() {
         Crypto crypto = new Crypto("Madness, and then illumination.");
         assertEquals(expectedOutput, crypto.getNormalizedCipherText());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void normalizedCipherIsSplitIntoSegmentsOfCorrectSize() {
         Crypto crypto = new Crypto("If man was meant to stay on the ground god would have given us roots");
         assertEquals(expectedOutput, crypto.getNormalizedCipherText());
     }
 
-    @Ignore
+    @Ignore("Remove to run test")
     @Test
     public void normalizedCipherTextIsSplitIntoSegmentsOfCorrectSizeWithPunctuation() {
         Crypto crypto = new Crypto("Have a nice day. Feed the dog & chill out!");