add readme

Author: rkpagadala

CONTRIBUTING.md

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+Want to contribute? Great! First, read this page (including the small print at the end).
+
+### Before you contribute
+Before we can use your code, you must sign the
+[Google Individual Contributor License Agreement]
+(https://cla.developers.google.com/about/google-individual)
+(CLA), which you can do online. The CLA is necessary mainly because you own the
+copyright to your changes, even after your contribution becomes part of our
+codebase, so we need your permission to use and distribute your code. We also
+need to be sure of various other things—for instance that you'll tell us if you
+know that your code infringes on other people's patents. You don't have to sign
+the CLA until after you've submitted your code for review and a member has
+approved it, but you must do it before we can put your code into our codebase.
+Before you start working on a larger contribution, you should get in touch with
+us first through the issue tracker with your idea so that we can help out and
+possibly guide you. Coordinating up front makes it much easier to avoid
+frustration later on.
+
+### Code reviews
+All submissions, including submissions by project members, require review. We
+use Github pull requests for this purpose.
+
+### The small print
+Contributions made by corporations are covered by a different agreement than
+the one above, the
+[Software Grant and Corporate Contributor License Agreement]
+(https://cla.developers.google.com/about/google-corporate).

README.md

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+# grpc-transcoding
+
+grpc-transcoding is a library that supports [transcoding](https://cloud.google.com/endpoints/docs/transcoding) so that HTTP/JSON can be converted to gRPC.
+
+It helps you to provide your APIs in both gRPC and RESTful style at the same time. The code is used in istio [proxy](https://github.com/istio/proxy)
+to provide HTTP+JSON interface to gRPC service.
+
+# Contribution
+See [CONTRIBUTING.md](http://github.com/grpc-ecosystem/grpc-transcoding/blob/master/CONTRIBUTING.md).
+
+# License
+grpc-transcoding is licensed under the Apache 2.0 license.
+See [LICENSE.txt](https://github.com/grpc-ecosystem/grpc-transcoding/blob/master/LICENSE.txt) for more details.
+