Update Scott Addie README

Scott Addie | What's New in ASP.NET Core 3/README.md

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-# DevReach 2019
+# What's new in ASP.NET Core 3.0
 
-Repo to house Speaker content from DevReach 2019.
+## Resources
+
+- [Slides](https://aka.ms/new-in-aspnetcore3)
+- [Sample app](https://aka.ms/contoso-lending)
+- [ASP.NET Core 2.2 to 3.0 migration guide](https://docs.microsoft.com/aspnet/core/migration/22-to-30)