Create .gitattributes

.gitattributes

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+src/core/ext/upb-generated/** linguist-generated=true
+src/core/ext/upbdefs-generated/** linguist-generated=true
+Makefile linguist-generated=true
+BUILD.gn linguist-generated=true
+CMakeLists.txt linguist-generated=true
+build_autogenerated.yaml linguist-generated=true
+config.m4 linguist-generated=true
+config.w32 linguist-generated=true
+gRPC-C++.podspec linguist-generated=true
+gRPC-Core.podspec linguist-generated=true
+gRPC-ProtoRPC.podspec linguist-generated=true
+gRPC-RxLibrary.podspec linguist-generated=true
+gRPC.podspec linguist-generated=true
+grpc.gemspec linguist-generated=true
+grpc.gyp linguist-generated=true
+grpc.def linguist-generated=true
+package.xml linguist-generated=true
+binding.gyp linguist-generated=true
+src/python/grpcio/grpc_core_dependencies.py linguist-generated=true
+src/ruby/ext/grpc/rb_grpc_imports.generated.h linguist-generated=true
+src/ruby/ext/grpc/rb_grpc_imports.generated.c linguist-generated=true
+test/core/end2end/end2end_tests.cc linguist-generated=true
+test/core/end2end/end2end_nosec_tests.cc linguist-generated=true
+test/core/surface/public_headers_must_be_c89.c linguist-generated=true
+tools/doxygen/Doxyfile.c++.internal linguist-generated=true
+tools/doxygen/Doxyfile.core.internal linguist-generated=true
+tools/run_tests/sources_and_headers.json linguist-generated=true
+tools/run_tests/tests.json linguist-generated=true
+tools/run_tests/generated/tests.json linguist-generated=true
+tools/run_tests/generated/sources_and_headers.json linguist-generated=true
+src/core/lib/transport/static_metadata.h linguist-generated=true
+src/core/lib/transport/static_metadata.cc linguist-generated=true