Help: Add release notes for 'vim-cmake-syntax' import

Help/release/dev/vim-cmake-syntax.rst

@@ -0,0 +1,11 @@
+vim-cmake-syntax
+----------------
+
+* Vim support files ``indent/cmake.vim`` and ``syntax/cmake.vim``
+  from the `vim-cmake-syntax`_ project are now distributed with CMake.
+
+* Vim support files ``cmake-indent.vim``, ``cmake-syntax.vim``, and
+  ``cmake-help.vim`` have been removed in favor of the files now provided
+  from the `vim-cmake-syntax`_ project.
+
+.. _`vim-cmake-syntax`: https://github.com/pboettch/vim-cmake-syntax