Add a clang-format configuration file

This ensures that IDEs such as CLion automatically use the correct
indentation, and running `git-clang-format` results in patches that are
actually quite close to the current style. It doesn't handle alignment
of parameters in function declarations, but otherwise it seems accurate.

diff --git a/.clang-format b/.clang-format
new file mode 100644 (file)
index 0000000..6c1859a
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,5 @@
+BasedOnStyle: GNU
+AlwaysBreakAfterDefinitionReturnType: All
+BreakBeforeBinaryOperators: None
+BinPackParameters: false
+SpaceAfterCStyleCast: true