Merge pull request #683 from Smarticles101/twelve-days-starter-implementation

twelve-days: create and validate starter implementation

exercises/twelve-days/src/main/java/TwelveDays.java

@@ -0,0 +1,9 @@
+class TwelveDays {
+    String verse(int verseNumber) {
+        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
+    }
+
+    String verses(int startVerse, int endVerse) {
+        throw new UnsupportedOperationException("Delete this statement and write your own implementation.");
+    }
+}