Add clone() Method

src/Potter/Cloneable/AbstractCloneable.php

@@ -6,5 +6,5 @@ namespace Potter\Cloneable;
 
 abstract class AbstractCloneable implements CloneableInterface
 {
-
+    abstract public function clone(): CloneableInterface;
 }

src/Potter/Cloneable/CloneableInterface.php

@@ -6,5 +6,5 @@ namespace Potter\Cloneable;
 
 interface CloneableInterface 
 {
-
+    public function clone(): self;
 }

src/Potter/Cloneable/CloneableTrait.php

@@ -6,5 +6,8 @@ namespace Potter\Cloneable;
 
 trait CloneableTrait 
 {
-
+    final public function clone(): CloneableInterface
+    {
+        return clone $this;
+    }
 }