[GENERAL] Add .clang-format to OpenMAMA root directory
[GENERAL] Add .clang-format to OpenMAMA root directory

Add a .clang-format file which is a close approximation to the OpenMAMA
coding standard. Based on the LLVM core style, with additional changes.

Can be used by either the clang-format tool, vim plugins, or Visual
Studio code for formatting OpenMAMA src files.

Signed-off By: Damian Maguire <damian.j.maguire@gmail.com>

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