[gnome-builder] doc: add exploration of searching

[Christian Hergert <chergert src gnome org>]

commit d86b9e6119e6c0a831e9cdf80450595aa4918237
Author: Christian Hergert <chergert redhat com>
Date:   Sat Sep 2 22:27:02 2017 -0700

    doc: add exploration of searching

 doc/exploring.rst             |   21 +++++++++++++++++++++
 doc/figures/file-search.png   |  Bin 0 -> 78249 bytes
 doc/figures/symbol-search.png |  Bin 0 -> 125218 bytes
 3 files changed, 21 insertions(+), 0 deletions(-)
---
diff --git a/doc/exploring.rst b/doc/exploring.rst
index a7e1380..cea1350 100644
--- a/doc/exploring.rst
+++ b/doc/exploring.rst
@@ -136,6 +136,27 @@ Use ``Shift+K`` if you're using Vim keybindings.
    :align: center
 
 
+Searching
+=========
+
+You can search for files and symbols in your project using the search entry at the top right.
+To focus the search entry with the keyboard use ``Control+.``.
+
+You can fuzzy search for files by typing a few characters from the file name.
+
+.. image:: figures/file-search.png
+   :width: 629 px
+   :align: center
+
+
+Builder will automatically index your project into a database if it uses a supported language.
+You can search this database to jump to code such as functions or classes.
+
+.. image:: figures/symbol-search.png
+   :width: 605 px
+   :align: center
+
+
 Preferences
 ===========
 
diff --git a/doc/figures/file-search.png b/doc/figures/file-search.png
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diff --git a/doc/figures/symbol-search.png b/doc/figures/symbol-search.png
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index 0000000..8dabca6
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