1) copy xinha folder into: cms/src/main/webapp directory
2) add config/xinha-config.xml to your project
3) add following node to hippoecm-extension.xml (note: change [PATH TO] part to fit your project settings):

  <sv:node sv:name="xinha-config">
    <sv:property sv:name="jcr:primaryType" sv:type="Name">
      <sv:value>hippo:initializeitem</sv:value>
    </sv:property>
    <sv:property sv:name="hippo:contentresource" sv:type="String">
      <sv:value>[PATH TO]/xinha-config.xml</sv:value>
    </sv:property>
    <sv:property sv:name="hippo:contentroot" sv:type="String">
      <sv:value>/hippo:namespaces/hippostd/html/editor:templates</sv:value>
    </sv:property>
    <sv:property sv:name="hippo:sequence" sv:type="Double">
      <sv:value>10010.3</sv:value>
    </sv:property>
  </sv:node>