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exercises/extending-pmd.md

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+# Extending PMD
+
+Use XPath to define a new rule for PMD to prevent complex code. The rule should detect the use of three or more nested `if` statements in Java programs so it can detect patterns like the following:
+
+```Java
+if (...) {
+    ...
+    if (...) {
+        ...
+        if (...) {
+            ....
+        }
+    }
+
+}
+```
+Notice that the nested `if`s may not be direct children of the outer `if`s. They may be written, for example, inside a `for` loop or any other statement.
+Write below the XML definition of your rule.
+
+You can find more information on extending PMD in the following link: https://pmd.github.io/latest/pmd_userdocs_extending_writing_rules_intro.html, as well as help for using `pmd-designer` [here](https://github.com/selabs-ur1/VV-ISTIC-TP2/blob/master/exercises/designer-help.md).
+
+Use your rule with different projects and describe you findings below. See the [instructions](../sujet.md) for suggestions on the projects to use.
+
+## Answer
+