[gnome-builder] add some notes to the README

[Christian Hergert <chergert src gnome org>]

commit 5854c3a083f715ddfbcad5b513ee1956397250d1
Author: Christian Hergert <christian hergert me>
Date:   Fri Dec 19 00:50:57 2014 -0800

    add some notes to the README

 README |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)
---
diff --git a/README b/README
index 5842a21..7fe1b8d 100644
--- a/README
+++ b/README
@@ -22,6 +22,25 @@ language if it makes sense.
 
 ----
 
+Builder is developed in conjunction with GNOME releases. This means that we
+often contribute to, and depend on, features being developed in other GNOME
+modules.
+
+Since there has not yet been a stable release of Builder, the easiest way to
+get started is to use the development tool jhbuild to install from source.
+
+  git clone git://git.gnome.org/jhbuild.git
+  cd jhbuild
+  ./autogen.sh
+  make
+  make install
+  jhbuild build gnome-builder
+  jhbuild run gnome-builder
+
+We hope to have VM images that can be used for testing in the near future.
+
+----
+
 Builder is licensed under the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or (at
 your option) any later version.