Created new top-level README_NEW

README_NEW.md

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+
+# Please pick your language to proceed:
+### [C++](https://github.com/grpc/grpc-common/tree/master/cpp)
+### [Java](https://github.com/grpc/grpc-common/tree/master/java)
+### [Python](https://github.com/grpc/grpc-common/tree/master/python)
+### [Go](https://github.com/grpc/grpc-common/tree/master/go)
+### [ruby](https://github.com/grpc/grpc-common/tree/master/ruby)
+### [Node.js](https://github.com/grpc/grpc-common/tree/master/node)