Add changes file for 5.0.3

Change-Id: I3fb115586f2207840da2f884c6451101190078e7
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

dist/changes-5.0.3.md

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+Qt Creator 5.0.3
+================
+
+Qt Creator version 5.0.3 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/v5.0.2..v5.0.3
+
+Editing
+-------
+
+### QML
+
+* Fixed possible crash on shutdown
+
+### Image Viewer
+
+* Fixed crash when opening invalid movie (QTCREATORBUG-26377)
+
+Projects
+--------
+
+### qmake
+
+* Fixed handling of `QMAKE_EXTRA_COMPILERS` (QTCREATORBUG-26323)
+
+Platforms
+---------
+
+### macOS
+
+* Fixed crash when opening qmake projects on ARM Macs (QTBUG-97085)
+
+### Android
+
+* Fixed issue in installation step with qmake projects (QTCREATORBUG-26357)
+
+Credits for these changes go to:
+--------------------------------
+Assam Boudjelthia  
+Christian Kandeler  
+Eike Ziller  
+Henning Gruendl  
+Jaroslaw Kobus  
+Johanna Vanhatapio  
+Jörg Bornemann  
+Kai Köhne  
+Kaj Grönholm  
+Leena Miettinen  
+Robert Löhning  
+Thomas Hartmann  
+Tim Jenssen