Update README

README.md

@@ -89,11 +89,43 @@ var_dump($manifest);
 ```
 use LearnosityQti\Converter;
 
-$xmlString = '<assessmentItem ...> ... </assessmentItem>'
+$xmlString = '<assessmentItem xsi:schemaLocation="http://www.imsglobal.org/xsd/imsqti_v2p1...> ... </assessmentItem>'
 list($item, $questions, $manifest) = Converter::convertQtiItemToLearnosity($xmlString);
 
 var_dump($item);
 var_dump($questions);
 var_dump($manifest);
 ```
 
+
+### Converting QTI Manifest XML string to Learnosity JSON
+
+The result from this function is highly opiniated and might not be what you want.
+
+The `$activity` is generated based on assessmentItem <resources>(s) with item references assumed to be the resource identifier and status set to be `published`. You might want to use the actual assessment item identifier or your custom identifier instead.
+The `$activityTags` is generated based on manifest metadata and the `$itemsTags` is based on the corresponding `resource` metadata. It simply flatten the XML structure with dot notation which you may need to parse it a bit more to suits your preferred Learnosity tags structure, ie. 
+
+```
+{
+    "educational": [
+        "intendedEndUserRole:source:IMSGLC_CC_Rolesv1p3",
+        "intendedEndUserRole:source:value:Learner"
+    ],
+    "lifeCycle": [
+        "version:string:Published"
+    ]
+}
+```
+
+Example usage
+
+```
+use LearnosityQti\Converter;
+
+$xmlString = '<?xml version="1.0" encoding="utf-8"?><manifest ...> ... </manifest>'
+list($activity, $activityTags, $itemsTags) = Converter::convertQtiManifestToLearnosity($xmlString);
+
+var_dump($activity);
+var_dump($activityTags);
+var_dump($itemsTags);
+```