add deprecation notice

Author: mreinstein

README.md

@@ -6,6 +6,22 @@ Nodeunit
 Simple syntax, powerful tools. Nodeunit provides easy async unit testing for
 node.js and the browser.
 
+
+DEPRECATED PROJECT
+-----
+
+The project is very stale. We've kept it working on new versions of node, and sometimes merged small PRs that help teams relying on nodeunit.
+
+Nodeunit was the arguably first testing framework developed for node. It was very useful at the time, but there's an overwhelming number
+of other worthwhile testing solutions out there that are actively maintained. tap, ava, tape, mocha, jasmine, jest, ... the list goes on and on.
+
+If Nodeunit were truly bringing some different philosophy to the testing scene I'd say yes effort should be made to shore up it's development,
+but given how many other great options there are out there, a benefit of letting it atrophy is it's one less choice people have to make when
+choosing a testing solution.  *You are strongly encouraged to check out other more modern testing options.*
+
+
+__Features__
+
 * Simple to use
 * Just export the tests from a module
 * Works with node.js and in the browser