add .clang-format

Change-Id: I6627b5569c2e0f730be7331403218b823a2c622f
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/threads/busthread.cpp b/threads/busthread.cpp
index f007bf9..59704e3 100644
--- a/threads/busthread.cpp
+++ b/threads/busthread.cpp
@@ -14,10 +14,9 @@
  * limitations under the License.
  */
 
-#include <string>
-
 #include "busthread.hpp"
 
+#include <string>
 
 void BusThread(struct ThreadParams& params)
 {