Doc improved, added astyle to the install list

coding-style.md

@@ -51,6 +51,16 @@ describe the preferred coding style for them in separate.
 
 + How to use vim plugins
 
+## Using Astyle in Qt Creator
+
++ Select **Help** > **About Plugins** > **C++** > **Beautifier** to enable the plugin.
+
++ Restart Qt Creator to be able to use the plugin (close Qt Creator and open it again).
+
++ Select **Tools** > **Options** > **Beautifier** to specify settings for beautifying files.
+
++ Select the **Enable auto format on file save** check box to automatically beautify files when you save them.
+
 
 ## References
 
@@ -60,3 +70,6 @@ describe the preferred coding style for them in separate.
 
 [PEP 8 -- Style Guide for Python Code](https://www.python.org/dev/peps/pep-0008/)
 
+[Qt Documentation - Beautifying Source Code](http://doc.qt.io/qtcreator/creator-beautifier.html)
+
+[Artistic Style 3.1 - A Free, Fast, and Small Automatic Formatter for C, C++, C++/CLI, Objective‑C, C#, and Java Source Code](http://astyle.sourceforge.net/astyle.html)