[pygobject] Add notes about branching to HACKING

[Tomeu Vizoso <tomeuv src gnome org>]

commit 8d1a36cc73f5f4df091ecb289c8a7b38ec2ab605
Author: Tomeu Vizoso <tomeu vizoso collabora com>
Date:   Mon Dec 12 18:35:30 2011 +0100

    Add notes about branching to HACKING

 HACKING |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/HACKING b/HACKING
index d2af74a..ca2af4c 100644
--- a/HACKING
+++ b/HACKING
@@ -15,6 +15,16 @@ Making a release
 
 Based on http://live.gnome.org/MaintainersCorner/Releasing
 
+Branching
+================
+
+Each cycle after the feature freeze, we create a stable branch so development can continue in the master branch unaffected by the freezes.
+
+1. Create the branch locally with: git checkout pygobject-3-2
+2. Push new branch: git push origin pygobject-3-2
+3. In master, update configure.ac to what will be the next version number (3.3.0)
+4. Announce the branching, send email telling people to continue development in master and cherry-picking the changes that are appropriate for the stable branch
+
 Tests
 =====