Clang: Let clangcodemodel/README point to the corresponding *.qdoc

Change-Id: I5526ed6ea6840ccecd8890adf6ef454e45ba98f9
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@theqtcompany.com>

src/plugins/clangcodemodel/README

@@ -1,59 +1 @@
-The ClangCodeModel plugin
-=========================
-
-The ClangCodeModel plugin integrates the clang frontend into Qt Creator. Clang
-is "a C language family frontend for LLVM". You can find more information at
-http://clang.llvm.org/.
-
-At the time of writing the plugin can replace the following functionality of
-the built-in code model:
-    * Highlighting
-    * Completion
-
-All other functionality relies on the built-in code model (indexing, quick
-fixes, follow symbol, find usages, ...).
-
-Setup
-=====
-
-Compile the plugin
-------------------
-
-1. Get libclang
-
-You need to have libclang (and thus llvm) installed on your system. Either
-build llvm/clang yourself [1], install some ready-to-use package [2] or use the
-package manager of your system.
-
-    [1] http://clang.llvm.org/get_started.html
-        See http://llvm.org/docs/GettingStarted.html#git-mirror for git mirrors.
-    [2] http://llvm.org/releases/ or http://llvm.org/builds/
-
-If you are building llvm/clang yourself, make sure to build it in release mode.
-
-2. Set LLVM_INSTALL_DIR and (re)build Qt Creator
-
-Point the LLVM_INSTALL_DIR variable to the build/installation directory of
-llvm, e.g.:
-
-    Installed via package manager on GNU/Linux:
-        LLVM_INSTALL_DIR=/usr/lib/llvm-3.4
-    Manually build on Unix in release mode:
-        LLVM_INSTALL_DIR=$HOME/llvm-build/Release+Asserts
-    Installed a snapshot on Windows:
-        LLVM_INSTALL_DIR=C:\llvm
-
-Set the variable either as part of the build environment or pass it directly to
-qmake and rebuild Qt Creator.
-
-Enable the plugin
------------------
-
-Enable the "ClangCodeModel" plugin in the dialog "Menu: Help -> About Plugins"
-and restart Qt Creator.
-
-Select the file types you want to use the ClangCodeModel for in "Menu: Tools ->
-Options -> C++ -> Tab: Code Model". For the next opened file matching the
-selected file types the ClangCodeModel will be used (see limitations at the
-start of this README).
-
+See ../../../doc/src/editors/creator-clang-codemodel.qdoc