improve exercise readme
@@ -117,9 +117,16 @@ General Security
Using the Exercise Module
-------------------------
-TODO
+The exercise module consists of training material in the form of test-cases that are to be 'fixed' based on the
+instructions in the description and the test-method (EXERCISE comments).
+In addition the module comes with examples for customizations and extensions that can be adjusted and plugged
+into an test repository for advanced learners.
How to Verify your Solutions
----------------------------
-TODO
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+The instructions and the EXERCISE comments indicate how the tests need to be adjusted.
+Run the tests in your IDE and verify that they pass to check if your solution is correct.
+
+NOTE: The module by default skips test execution. Enable test verification if you intend to verify your solutions with
+'mvn clean install'.
\ No newline at end of file
