[gnome-builder] doc: add blurb on building your project

[Christian Hergert <chergert src gnome org>]

commit d6cdec8126383ce35cbb0697658b2e6b10dbb34e
Author: Christian Hergert <chergert redhat com>
Date:   Tue Mar 14 16:47:26 2017 -0700

    doc: add blurb on building your project

 doc/projects/building.rst |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/doc/projects/building.rst b/doc/projects/building.rst
index 87510e1..5d179fe 100644
--- a/doc/projects/building.rst
+++ b/doc/projects/building.rst
@@ -2,7 +2,14 @@
 Building your Project
 #####################
 
+To build your project, use the Build Button on the right of the OmniBar as shown in the figure below.
+
+Additionally, you can use ``Control+F7`` to activate a build.
+
+If you prefer the command bar, use ``Control+Enter`` to activate the command bar and type "build" followed 
by Enter to activate the build command.
+
 .. image:: ../figures/omnibar.png
    :align: center
    :width: 495 px
 
+