Add changelog for 5.6.0

Change-Id: I12ac0a0423f14b7aa2afaa86eed5ac7d64de4d56
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@theqtcompany.com>

dist/changes-5.6.0

@@ -0,0 +1,37 @@
+Qt 5.6 introduces many new features and improvements along with bug fixes
+over the 5.5.x series. For more details, refer to the documentation
+included in this distribution. The documentation is also available online:
+
+  http://doc.qt.io/qt-5
+
+The Qt version 5.6 series is binary compatible with the 5.5.x series.
+Applications compiled for 5.5 will continue to run with 5.6.
+
+Some of the changes listed in this file include issue tracking numbers
+corresponding to tasks in the Qt Bug Tracker:
+
+  https://bugreports.qt.io/
+
+Each of these identifiers can be entered in the bug tracker to obtain more
+information about a particular change.
+
+****************************************************************************
+*                           General                                        *
+****************************************************************************
+
+ - Fixed several instances of missing, incorrect or obsolete information.
+ - Updated documentation on supported platforms.
+ - Improved documentation on Windows/Dynamically Loading Graphics Drivers.
+ - Updated HiDPI documentation.
+ - Improved embedded Linux documentation.
+ - Added documentation and links for new modules in Qt 5.6.
+ - Moved Qt Location and Qt WebView from technology preview modules to Qt
+   add-on modules.
+ - Added Qt Labs Controls, Qt Serial Bus, and Qt Wayland Compositor as
+   technology preview modules.
+ - Replaced references to Qt WebKit with Qt WebEngine where applicable,
+   and removed Qt WebKit documentation.
+ - Deprecated Qt Enginio documentation.
+ - Added automatically generated list of examples from all Qt modules.
+ - Updated license documentation for 3rd party libraries used in the new
+   Qt modules.