Add a .clang-format config file and reformat all C++ source code using that. Also added some documentation on the preferred style in CONTRIBUTING.md.
diff --git a/include/fruit/impl/meta/pair.h b/include/fruit/impl/meta/pair.h
index 00fd782..10d8a3e 100644
--- a/include/fruit/impl/meta/pair.h
+++ b/include/fruit/impl/meta/pair.h
@@ -4,9 +4,9 @@
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *     http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -54,5 +54,4 @@
 } // namespace impl
 } // namespace fruit
 
-
 #endif // FRUIT_META_PAIR_H