added code climate and sensible phpmd rules

Author: Kirill Fuchs

.codeclimate.yml

@@ -0,0 +1,36 @@
+engines:
+  duplication:
+    enabled: true
+    config:
+      languages:
+      - ruby
+      - javascript
+      - python
+      - php
+  fixme:
+    enabled: true
+  phpmd:
+    enabled: true
+    checks:
+      Controversial/CamelCaseVariableName:
+        enabled: false
+      Controversial/CamelCasePropertyName:
+        enabled: false
+      Controversial/CamelCaseMethodName:
+        enabled: false
+      Controversial/CamelCaseParameterName:
+        enabled: false
+    config:
+      file_extensions: "php"
+      rulesets: "unusedcode,codesize,phpmd.rulesets.xml"
+ratings:
+  paths:
+  - "**.inc"
+  - "**.js"
+  - "**.jsx"
+  - "**.module"
+  - "**.php"
+  - "**.py"
+  - "**.rb"
+exclude_paths:
+- tests/

phpmd.rulesets.xml

@@ -0,0 +1,37 @@
+<?xml version="1.0"?>
+<ruleset name="PHPMD rule set for my project" 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>Custom rules for checking my project</description>
+
+    <rule ref="rulesets/controversial.xml">
+        <exclude name="CamelCaseVariableName"/>
+        <exclude name="CamelCasePropertyName"/>
+        <exclude name="CamelCaseMethodName"/>
+        <exclude name="CamelCaseParameterName"/>
+    </rule>
+
+    <rule ref="rulesets/naming.xml">
+        <exclude name="ShortVariable"/>
+        <exclude name="ShortMethodName"/>
+    </rule>
+
+    <rule ref="rulesets/naming.xml/ShortVariable"
+            since="0.2"
+            message="Avoid variables with short names like {0}. Configured minimum length is {1}."
+            class="PHPMD\Rule\Naming\ShortVariable"
+            externalInfoUrl="http://phpmd.org/rules/naming.html#shortvariable">
+        <priority>3</priority>
+        <properties>
+            <property name="minimum" description="Minimum length for a variable, property or parameter name" value="3"/>
+            <property name="exceptions" value="is,in,or,id,q,i,j,v,e,f,fp" />
+        </properties>
+    </rule>
+
+    <rule ref="rulesets/naming.xml/ShortMethodName">
+        <properties>
+            <property name="exceptions" value="is,in,or" />
+        </properties>
+    </rule>
+</ruleset>