Add a tree-conflicts "policy" document, with initial content describing the basic requirements.
Add a tree-conflicts "policy" document, with initial content describing
the basic requirements.

Initially added in /branches/tree-conflicts, but moved to the trunk instead,
as that is where we are maintaining these documents.

* notes/tree-conflicts/policy.txt
  New file (previously in /branches/tree-conflicts/... until r30434).

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion