Add links to XML2KDL repo/online editor (#301)

Low effort KDLing should be easy :D

XML-IN-KDL.md

@@ -7,7 +7,7 @@ This is version 1.0.0 of XiK.
 
 XML-in-KDL (XiK from now on) is a KDL microsyntax for losslessly encoding XML into a KDL document. XML and KDL, luckily, have *very similar* data models (KDL is *almost* a superset of XML), so it's quite straightforward to encode most XML documents into KDL.
 
-See [the website example](examples/website.kdl) for an example of this grammar in use to encode an HTML document.
+See [the website example](examples/website.kdl) for an example of this grammar in use to encode an HTML document. See [XML2KDL](https://github.com/Devasta/XML2KDL) (third party) to encode your XML in KDL (especially [their online editor](https://xsltfiddle.liberty-development.net/bET2rY5)).
 
 XML has several types of nodes, corresponding to certain KDL constructs: