Add README for release notes

releases/reference-assemblies/README.md

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+# Preview of .NET Framework Targeting Pack Nuget packages
+
+## Status
+
+Early preview.
+
+## Goal
+
+Enable building projects targeting .NET Framework on machines without the machine-wide, Windows-only .NET Framework targeting packs.
+
+## Benefits
+
+- Support OSS .NET development on non-Windows operating systems.
+- Enable machines to build projects targeting .NET Framework without requiring a machine-wide, admin-permission install.
+- Enable developing Mono projects with the .NET CLI.
+
+## Package location
+
+https://dotnet.myget.org/feed/roslyn-tools/package/nuget/Microsoft.NETFramework.ReferenceAssemblies
+
+## Latest release
+
+Version:	1.0.0-alpha-5
+Releases:	Tue, 04 Dec 2018 00:13:27 GMT
+