#4: implement package violations

src/main/java/com/devonfw/sample/archunit/violation/CaptialViolation/P3CapitalViolation.java

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+package com.devonfw.sample.archunit.violation.CaptialViolation;
+
+public class P3CapitalViolation {
+    // No layer have capital letters in its name.
+}

src/main/java/com/devonfw/sample/archunit/violation/P1NoLayer.java

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+package com.devonfw.sample.archunit.violation;
+
+public class P1NoLayer {
+    // no class should be without a Layer
+}

src/main/java/com/devonfw/sample/archunit/violation/violationlayer/P2ViolationLayer.java

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+package com.devonfw.sample.archunit.violation.violationlayer;
+
+public class P2ViolationLayer {
+    // No layer should have the name violation, resulting in the error for this class.
+}