Add tasks for all the new languages

Task/Leap-year/Ring/leap-year.ring

@@ -0,0 +1,10 @@
+give year
+leap = isLeapYear(year)
+if leap true see year + " is leap year."
+else see year + " is not leap year." ok
+
+Func isLeapYear year
+     if (year % 400) = 0 return true
+        but (year % 100) = 0 return false
+        but (year % 4) = 0 return true
+        else return false ok