Add TODO list for test utils

testutils/readme.txt

@@ -0,0 +1,5 @@
+Old test utils from 2012:
+https://code.google.com/r/bel2125-mongoose/source/browse/#hg%2Ftestclient
+https://code.google.com/r/bel2125-mongoose/source/browse/#hg%2FBrowser
+
+TODO: check if they still work, fix them, add to standard tests