Document new branch structure.

README.rst

 Packaging files for Varnish Cache
 =================================
 
-This repository contains the necessary scripts to package up
-Varnish Cache.
+This repository contains the necessary scripts to package up Varnish Cache.
 
 How to build
 ------------
@@ -15,9 +14,24 @@ The flow is roughly:
 3) Run ./package-deb or ./package-rpm.
 
 
+Branch structure
+----------------
+
+This repository will contain a master branch and zero or more
+maintenance branches. (4.0, 3.0)
+
+master should be used to build the last stable release _and_ the development
+release, all the way up until development diverges enough that it isn't
+useful/possible any more.
+
+At that point, a maintenance branch should be branched off. These should be
+deleted from git 12 months after the release is end of life. Before deletion,
+a git archive of the branch should be extracted and made public.
+
+
 Contact
 -------
 
-You can reach the developers and packagers using the normal
-email list: <varnish-dev@varnish-cache.org>
+You can reach the developers and packagers using this email list:
+<varnish-dev@varnish-cache.org>