docs: Add info for layer tests to CONTRIBUTING

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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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@@ -66,6 +66,17 @@ that might arise with Vulkan-LoaderAndValidationLayers components if they were o
 * Run tests that explicitly exercise your changes.
 * Feel free to subject your code changes to other tests as well!
 
+#### **Special Considerations for Validation Layers**
+If you are submitting a change that adds a new validation check, you should also construct a "negative" test function.
+The negative test function purposely violates the validation rule that the new validation check is looking for.
+The test should cause your new validation check to identify the violation and issue a validation error report.
+And finally, the test should check that the validation error report is generated and consider the test as "passing"
+if the report is received.  Otherwise, the test should indicate "failure".
+This new test should be added to the validation layer test program in the `tests` directory and contributed
+at the same time as the new validation check itself.
+There are many existing validation tests in this directory that can be used as a starting point.
+
+
 ### **Contributor License Agreement (CLA)**
 
 #### **Khronos Repository (Vulkan-LoaderAndValidationLayers)**