Add .clang-format to repo for automated style

Add .clang-format to repo for automated style.  A consistent style
across Openbmc makes the code easier to read and edit.

Change-Id: I7c09792d2482f0be3e01776804347700f3e3e651
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/types.hpp b/types.hpp
index 4e30208..196e0fd 100644
--- a/types.hpp
+++ b/types.hpp
@@ -1,10 +1,10 @@
 #pragma once
 
 #include <climits>
-#include <vector>
-#include <string>
 #include <map>
 #include <sdbusplus/server.hpp>
+#include <string>
+#include <vector>
 
 namespace openpower
 {