Add first changes file for 4.12.1

Change-Id: Ibd3ca94c588fd322d59dcf3d9ac13bbdb9ffc34c
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

dist/changes-4.12.1.md

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+Qt Creator 4.12.1
+=================
+
+Qt Creator version 4.12.1 contains bug fixes.
+
+The most important changes are listed in this document. For a complete
+list of changes, see the Git log for the Qt Creator sources that
+you can check out from the public Git repository. For example:
+
+    git clone git://code.qt.io/qt-creator/qt-creator.git
+    git log --cherry-pick --pretty=oneline origin/v4.12.0..v4.12.1
+
+General
+-------
+
+* Fixed crash when changing font settings (QTCREATORBUG-14385)
+
+Editing
+-------
+
+### C++
+
+* Fixed crash when loading settings from Qt Creator < 4.11 (QTCREATORBUG-23916)
+
+### QML
+
+* Fixed semantic highlighting (QTCREATORBUG-23729, QTCREATORBUG-23777)
+* Fixed wrong symbol highlighting (QTCREATORBUG-23830)
+* Fixed warning for `palette` property (QTCREATORBUG-23830)
+
+Projects
+--------
+
+### qmake
+
+* Fixed that run button could stay disabled after parsing
+
+### CMake
+
+* Fixed issue with JOM (QTCREATORBUG-22645)
+
+### Compilation Database
+
+* Fixed issues with symbolic links (QTCREATORBUG-23511)
+
+Debugging
+---------
+
+* Fixed pretty printing of `std::unique_ptr` with custom deleter (QTCREATORBUG-23885)
+
+
+Qt Quick Designer
+-----------------
+
+* Fixed crash after building emulation layer (QTCREATORBUG-20364)
+* Fixed crash when opening `.qml` file instead of `.qml.ui` file (QDS-2011)
+
+Test Integration
+----------------
+
+* Fixed handling of test output (QTCREATORBUG-23939)
+
+Platforms
+---------
+
+### Android
+
+* Fixed crash at startup when Qt is missing in Kit (QTCREATORBUG-23963)
+* Fixed `Always use this device for this project` (QTCREATORBUG-23918)
+
+### OpenBSD
+
+* Fixed Qt ABI detection (QTCREATORBUG-23818)
+
+Credits for these changes go to:
+--------------------------------