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/write.hpp b/write.hpp
index 2e7fe33..0544bdf 100644
--- a/write.hpp
+++ b/write.hpp
@@ -1,7 +1,7 @@
 #pragma once
 
-#include <string>
 #include <store.hpp>
+#include <string>
 
 namespace openpower
 {
@@ -16,10 +16,9 @@
  *  @param [in] vpdStore - Store object containing parsed VPD
  *  @param [in] path - FRU object path
  */
-void write(const std::string& type,
-           const Store& vpdStore,
+void write(const std::string& type, const Store& vpdStore,
            const std::string& path);
 
-} // inventory
+} // namespace inventory
 } // namespace vpd
 } // namespace openpower