added more comments

README.md

@@ -25,6 +25,8 @@ Other aspects were not so important to us:
 
 - **Speed**. We currently implement the parser as naive [recursive descent parser](http://en.wikipedia.org/wiki/Recursive_descent_parser) with hand coded string handling. It is fast enough, but a [LALR-parser](http://en.wikipedia.org/wiki/LALR_parser) with a decent regular expression processor should be even faster (but would consist of more files which makes the integration harder).
 
+See the [https://github.com/nlohmann/json/blob/master/CONTRIBUTING.md#please-dont](contribution guidelines) for more information.
+
 ## Integration
 
 The single required source, file `json.hpp` is in the `src` directory or [released here](https://github.com/nlohmann/json/releases). All you need to do is add