Adds readme

[#171770870]

Signed-off-by: Ryan Moran <[email protected]>

README.md

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+# Dotnet Core Cloud Native Buildpack
+
+The Dotnet Cloud Native Buildpack provides a set of collaborating buildpacks that
+enable the building of a Dotnet Core-based application. These buildpacks include:
+- [Dotnet Core Runtime CNB](https://github.com/paketo-buildpacks/dotnet-core-runtime)
+- [Dotnet Core ASPNet CNB](https://github.com/paketo-buildpacks/dotnet-core-aspnet)
+- [Dotnet Core SDK CNB](https://github.com/paketo-buildpacks/dotnet-core-sdk)
+- [Dotnet Core Build CNB](https://github.com/paketo-buildpacks/dotnet-core-build)
+- [Dotnet Core Conf CNB](https://github.com/paketo-buildpacks/dotnet-core-conf)
+
+The buildpack supports building both runtime-dependent and self-contained
+applications. Additionally, the buildpack supports a number of combinations of
+runtimes, SDKs, and ASPNet library configurations.
+
+The buildpack supports the inclusion of
+[NodeJS](https://nodejs.org) for applications that may require it. This support
+is provided by the [Node Engine
+CNB](https://github.com/paketo-buildpacks/node-engine).