Merge pull request #39 from a11r/d3

New top level README and cpp/README to set up navigation structure.

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)

cpp/README.md

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+#gRPC C++ Getting started
+
+First you need to install gRPC on your system. Follow the instructions here:
+[https://github.com/grpc/grpc/blob/master/INSTALL](https://github.com/grpc/grpc/blob/master/INSTALL).
+
+After installing, you can proceed to the [gRPC C++ Hello World tutorial](https://github.com/grpc/grpc-common/cpp/helloworld).
+
+A more detailed tutorial is coming soon.