Add changes-6.0.0.md

Change-Id: Idd8671e7ae4b4252237ad8853e3191a88ea4996e
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

dist/changes-6.0.0.md

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+Qt Creator 6
+===============
+
+Qt Creator version 6 contains bug fixes and new features.
+
+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/5.0..v6.0.0
+
+General
+-------
+
+* ...
+
+Editing
+-------
+
+### C++
+
+### QML
+
+### Language Client
+
+### Beautifier
+
+### Designer
+
+Projects
+--------
+
+Debugging
+---------
+
+### GDB
+
+* Dropped support for GDB versions using Python version 2.x.
+  Python 3.6+ is required now.
+
+### QML
+
+Analyzer
+--------
+
+FakeVim
+-------
+
+Platforms
+---------
+
+### Windows
+
+### macOS
+
+### Android
+
+### Remote Linux
+
+### QNX
+
+### MCU
+
+
+Credits for these changes go to:
+--------------------------------