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

Client: C++
Patch: Konrad Grochowski

make style command added
diff --git a/tutorial/cpp/Makefile.am b/tutorial/cpp/Makefile.am
index 9768c51..3b38240 100755
--- a/tutorial/cpp/Makefile.am
+++ b/tutorial/cpp/Makefile.am
@@ -76,6 +76,9 @@
 tutorialclient: all
 	./TutorialClient
 
+style-local:
+	$(CPPSTYLE_CMD)
+
 EXTRA_DIST = \
 	CppClient.cpp \
 	CppServer.cpp