add new Governance and Policies section to Readme

With wording prohibiting PRs of thousands of lines.

README.md

@@ -86,6 +86,18 @@ Video Demonstration
 
 Apache Fineract / Mifos X Demo (November 2016) - <https://www.youtube.com/watch?v=h61g9TptMBo>
 
+Governance and Policies
+=======================
+
+This project does not accept "code dumps" 
+i.e. massive huge Pull Requests of major new 
+features consisting of thousands of lines of new code,
+typically developed in "downstream" closed source 
+munged into a single PR, because such contributions 
+are typically simply impossible to code review realistically. 
+Instead, please engage in the usual open source way of proposing 
+small incremental changes leading up to bigger new features. 
+
 More Information
 ============
 More details of the project can be found at <https://cwiki.apache.org/confluence/display/FINERACT>.