Add "Keep build panel visible" to PlatformIO IDE FAQ

HISTORY.rst

@@ -7,6 +7,8 @@ PlatformIO 2.0
 2.9.2 (2016-??-??)
 ~~~~~~~~~~~~~~~~~~
 
+* Added support for Silicon Labs SLSTK3401A (Pearl Gecko) and
+  MultiTech mDot F411 ARM mbed based boards
 * Added support for MightyCore ATmega8535 board
   (`issue #585 <https://github.com/platformio/platformio/issues/585>`_)
 * Use HTTP mirror for Package Manager in a case with SSL errors

docs/ide/atom.rst

@@ -437,6 +437,14 @@ To force Smart Code Linter to use Arduino files as C++ please
 Frequently Asked Questions
 --------------------------
 
+Keep build panel visible
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+PlatformIO IDE hides build panel on success by default. Nevertheless, you can
+keep it visible all time. Please follow to
+``Menu: PlatformIO > Settings > Build`` and set ``Panel Visibility`` to
+``Keep Visible``.
+
 Automatically save on build
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~