This commit adds a chapter 'CLion integration' to ClangFormat.rst.
The official announcement of clang-format support in CLion 2019.1: https://blog.jetbrains.com/clion/2019/03/clion-2019-1-embedded-dev-clangformat-memory-view/
Patch by Marina Kalashina
Maybe add a link to CLion here? I didn't know what it was :)