Add XML code style matching Maven's convention for POMs

.idea/codeStyles/Project.xml

@@ -28,6 +28,11 @@
       <option name="JD_ADD_BLANK_AFTER_DESCRIPTION" value="false" />
       <option name="JD_INDENT_ON_CONTINUATION" value="true" />
     </JavaCodeStyleSettings>
+    <XML>
+      <option name="XML_ATTRIBUTE_WRAP" value="0" />
+      <option name="XML_ALIGN_ATTRIBUTES" value="false" />
+      <option name="XML_SPACE_INSIDE_EMPTY_TAG" value="true" />
+    </XML>
     <codeStyleSettings language="JAVA">
       <option name="KEEP_FIRST_COLUMN_COMMENT" value="false" />
       <option name="KEEP_CONTROL_STATEMENT_IN_ONE_LINE" value="false" />
@@ -55,5 +60,12 @@
         <option name="SMART_TABS" value="true" />
       </indentOptions>
     </codeStyleSettings>
+    <codeStyleSettings language="XML">
+      <indentOptions>
+        <option name="INDENT_SIZE" value="2" />
+        <option name="CONTINUATION_INDENT_SIZE" value="4" />
+        <option name="TAB_SIZE" value="2" />
+      </indentOptions>
+    </codeStyleSettings>
   </code_scheme>
 </component>