add a README file

.hgignore

@@ -1,3 +1,5 @@
+QtC*
+
 syntax: glob
 .DS_Store
 ./bin

README

@@ -0,0 +1,4 @@
+Since the Normative Types specification is not yet at Public Working Draft level,
+any implementation must be considered alpha. The implementations of helpers under
+this repo must be considered alpha level.
+