Add deprecation notice

README.md

@@ -1,5 +1,8 @@
-additional date-time classes that complement those in js-joda
-==============================================
+# !This package is deprecated!
+
+The current version has been moved to the js-joda mono repository, see https://github.com/js-joda/js-joda
+
+# additional date-time classes that complement those in js-joda
 
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