Add changes file

List the major new changes listed in the wiki.

The list is not yet complete though, and needs to be expanded.

Change-Id: I3d8b418518f63a6fdac236b580b4891ac409817b
Reviewed-by: Michael Brüning <michael.bruning@theqtcompany.com>

dist/changes-5.6.0

+Qt 5.6 introduces many new features and improvements as well as bugfixes
+over the 5.5.x series. For more details, refer to the online documentation
+included in this distribution. The documentation is also available online:
+
+  http://doc.qt.io/qt-5/index.html
+
+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                                         *
+****************************************************************************
+
+ - Chromium Snapshot:
+   * The Chromium version has been updated to 45.0.2554.101.
+   * In addition security fixes from Chromium 46 and 47 have been merged.
+
+ - General:
+   * The WebEngineCore module now contains shared C++ API.
+   * Will now follow Qt Network application proxy settings.
+
+ - Platforms:
+   * Linux builds can now link against system libraries instead of Chromium's
+     bundled versions.
+   * Support for the Aarch64 architecture.
+
+ - Web Features:
+   * PPAPI plugins are now supported, including the Flash plugin.
+
+****************************************************************************
+*                          Qt WebEngineCore                                *
+****************************************************************************
+
+ - QWebEngineCookieStore:
+   * A new API for monitoring and controlling cookies.
+
+ - QWebEngineUrlRequestInterceptor:
+   * A new API for blocking, modifying or redirecting URL requests.
+
+ - QWebEngineUrlSchemeHandler:
+   * A new API for implementing custom URL schemes.
+
+****************************************************************************
+*                          Qt WebEngineQML                                 *
+****************************************************************************
+
+ - QQuickWebEngineProfile:
+   * Now a public C++ API for use with the new core APIs.
+
+ - QQuickWebEngineView:
+   * WebAction API added.
+
+
+****************************************************************************
+*                        Qt WebEngineWidgets                               *
+****************************************************************************
+
+ - QWebEnginePage:
+   * More WebActions added from the old QWebPage API.
+
+****************************************************************************
+*                              Examples                                    *
+****************************************************************************
+
+ - General:
+   * Examples have been renamed to make their purpose more clear.