[gnome-builder] doc: add exploring docs on splitting windows

[Christian Hergert <chergert src gnome org>]

commit 103f3f67b362d480c65f5d4a977454bf8f3d348f
Author: Christian Hergert <chergert redhat com>
Date:   Sat Sep 2 22:39:10 2017 -0700

    doc: add exploring docs on splitting windows

 doc/exploring.rst                   |   19 +++++++++++++++++++
 doc/figures/open-in-new-frame-1.png |  Bin 0 -> 73383 bytes
 doc/figures/open-in-new-frame-2.png |  Bin 0 -> 223608 bytes
 3 files changed, 19 insertions(+), 0 deletions(-)
---
diff --git a/doc/exploring.rst b/doc/exploring.rst
index cea1350..51d682c 100644
--- a/doc/exploring.rst
+++ b/doc/exploring.rst
@@ -136,6 +136,25 @@ Use ``Shift+K`` if you're using Vim keybindings.
    :align: center
 
 
+Splitting Windows
+-----------------
+
+Builder can show you multiple editors side-by-side.
+In the editor view use "Open in New Frame" to split a document into two views.
+
+.. image:: figures/open-in-new-frame-1.png
+   :width: 396 px
+   :align: center
+
+Afterwards, you'll see the editors side-by-side like such:
+
+.. image:: figures/open-in-new-frame-2.png
+   :width: 1122 px
+   :align: center
+
+To close a split, use the close button in the top right of the editor.
+
+
 Searching
 =========
 
diff --git a/doc/figures/open-in-new-frame-1.png b/doc/figures/open-in-new-frame-1.png
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diff --git a/doc/figures/open-in-new-frame-2.png b/doc/figures/open-in-new-frame-2.png
new file mode 100644
index 0000000..7176294
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