Add example usage, link to datacite

README.md

@@ -6,9 +6,12 @@ Begun by Peter L. Evans in Berlin, Germany, March 2018.
 
 Bibliographic chaos may ensue if it is not used correctly.
 
-Use under Gnu Public License (GPL) Version 3.0. See LICENCE.
-This software comes with absolutely no warranty.
+Use under Gnu Public License (GPL) Version 3.0. http://www.gnu.org/licenses/
 
+    xml2bib is Copyright (C) 2018 Peter L. Evans.
+    This software comes with ABSOLUTELY NO WARRANTY.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; see `LICENSE` for details.
 
 BibTeX is a widely-used format for references, introduced by Oren
 Patashnik in the late 20th century. Despite its age, it is still
@@ -18,6 +21,7 @@ http://www.bibtex.org/Format/
 
 DataCite is ... the provider and maintainer of DataCite XML,
 a schema for metadata about digital objects.
+http://datacite.org
 
 
 Using xml2bib
@@ -29,6 +33,11 @@ Using xml2bib
 
     e.g. python xml2bib.py xmlfiles/*  runs xml2bib on all the files listed on the command line.
 
-2. As a Python module. Load your XML, then call xml2dict, and the str() method of BibTeXWriter. [add example]
+2. As a Python module. Load your XML, then call xml2dict, and the str() method of BibTeXWriter.
 
+        import xml2bib
+
+        x = xml2bib.XMLReader('mydatacitefile.xml')
+        d = xml2bib.xml2dict(x)
+        print(str(BibTeXWriter('mytagname', d)))