[gnome-devel-docs/dx-hackfest] Add the Gnome Equation logo, copied from new-platform-overview

[Federico Mena Quintero <federico src gnome org>]

commit 9f77bfaa0b2e7ce478a27fec0bbac3d375613b80
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue May 21 18:11:20 2013 -0500

    Add the Gnome Equation logo, copied from new-platform-overview
    
    Signed-off-by: Federico Mena Quintero <federico gnome org>

 platform-overview/C/equation.png |  Bin 0 -> 17579 bytes
 platform-overview/C/index.page   |    4 ++++
 2 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/platform-overview/C/equation.png b/platform-overview/C/equation.png
new file mode 100644
index 0000000..295d843
Binary files /dev/null and b/platform-overview/C/equation.png differ
diff --git a/platform-overview/C/index.page b/platform-overview/C/index.page
index 0166d6a..641d652 100644
--- a/platform-overview/C/index.page
+++ b/platform-overview/C/index.page
@@ -26,6 +26,10 @@
 
 <title>Overview of the GNOME Platform</title>
 
+<media src="equation.png">
+ <p>GNOME equation</p>
+</media>
+
 <p>GNOME is a powerful desktop environment with a strong focus
 on usability, accessibility, and internationalization.  GNOME is designed to
 be usable by everybody, regardless of technical expertise, disabilitites, or