Add Contributing and ReadMe

CONTRIBUTING.md

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+Contributing
+======
+
+Information on contributing to this repo is in the [Contributing Guide](https://github.com/aspnet/Home/blob/master/CONTRIBUTING.md) in the Home repo.

README.md

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+Caching
+================
+
+Contains libraries for caching for ASP.NET vNext.
+
+This project is part of ASP.NET vNext. You can find samples, documentation and getting started instructions for ASP.NET vNext at the [Home](https://github.com/aspnet/home) repo.
+
+
+