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

Client: C++
Patch: Konrad Grochowski

make style command added
diff --git a/compiler/cpp/Makefile.am b/compiler/cpp/Makefile.am
index d3dadab..559a839 100644
--- a/compiler/cpp/Makefile.am
+++ b/compiler/cpp/Makefile.am
@@ -117,3 +117,6 @@
 	$(RM) thriftl.cc thrifty.cc thrifty.h thrifty.hh version.h windows/version.h
 
 src/main.cc: version.h
+
+style-local:
+	$(CPPSTYLE_CMD)