Adding analyzer feedback for secrets concept exercise (#2736)

* Adding analyzer feedback for secrets concept exercise

* adding an extra informative comment separating the ~ operator

exercises/concept/secrets/.meta/design.md

@@ -17,3 +17,18 @@ The goal of this exercise is to teach the student about bitwise operations in Ja
 This exercise's prerequisites Concepts are:
 
 - 'numbers'
+
+## Analyzer
+
+This exercise could benefit from the following rules in the [analyzer]:
+
+- `essential`: If the student did not use the `>>>` operator in the `shiftBack` method, instruct the student to do so.
+- `essential`: If the student did not use the `|` operator in the `setBits` method, instruct the student to do so.
+- `essential`: If the student did not use the `^` operator in the `flipBits` method, instruct the student to do so.
+- `essential`: If the student did not use the `&` operator in the `clearBits` method, instruct the student to do so.
+- `informative`: If the solution did not use the `~` operator in the `clearBits` method, inform the student that with it will achieve a more concise solution.
+
+If the solution does not receive any of the above feedback, it must be exemplar.
+Leave a `celebratory` comment to celebrate the success!
+
+[analyzer]: https://github.com/exercism/java-analyzer