test(mess detector): Setting PHP Mess Detector tool

Author: julienloizelet

composer.json

@@ -40,6 +40,7 @@
         "bramus/monolog-colored-line-formatter": "^3.0",
         "symfony/var-dumper": "^5.2",
         "phpunit/phpunit": "8.5.21",
-        "clean/phpdoc-md": "^0.19.1"
+        "clean/phpdoc-md": "^0.19.1",
+        "phpmd/phpmd": "@stable"
     }
 }

docs/ddev.md

@@ -235,4 +235,13 @@ And then:
 ```
 ddev exec PHP_CS_FIXER_IGNORE_ENV=1 ./my-own-modules/crowdsec-php-lib/tools/php-cs-fixer/vendor/bin/php-cs-fixer fix ./my-own-modules/crowdsec-php-lib
 
+```
+
+#### PHP Mess Detector
+
+To use the `phpmd` tool, you can run:
+
+```
+ddev phpmd ./my-own-modules/crowdsec-php-lib tools/phpmd/rulesets.xml src
+
 ```

tools/phpmd/rulesets.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0"?>
+<ruleset name="CrowdSec PHP Lib rule set"
+         xmlns="http://pmd.sf.net/ruleset/1.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://pmd.sf.net/ruleset/1.0.0
+                       http://pmd.sf.net/ruleset_xml_schema.xsd"
+         xsi:noNamespaceSchemaLocation="
+                       http://pmd.sf.net/ruleset_xml_schema.xsd">
+    <description>
+        Rule set that checks CrowdSec PHP lib
+    </description>
+
+    <rule ref="rulesets/codesize.xml" />
+    <rule ref="rulesets/cleancode.xml" />
+    <rule ref="rulesets/unusedcode.xml" />
+</ruleset>