THRIFT-2729: C++ - .clang-format created and applied

Client: C++
Patch: Konrad Grochowski

make style command added
diff --git a/lib/cpp/test/DebugProtoTest_extras.cpp b/lib/cpp/test/DebugProtoTest_extras.cpp
index c89db74..5c4fd35 100644
--- a/lib/cpp/test/DebugProtoTest_extras.cpp
+++ b/lib/cpp/test/DebugProtoTest_extras.cpp
@@ -21,13 +21,15 @@
 
 #include "gen-cpp/DebugProtoTest_types.h"
 
-
-namespace thrift { namespace test { namespace debug {
+namespace thrift {
+namespace test {
+namespace debug {
 
 bool Empty::operator<(Empty const& other) const {
-  (void) other;
+  (void)other;
   // It is empty, so all are equal.
   return false;
 }
-
-}}}
+}
+}
+}