Add what's new page for April 2020 (#18084)

* Add what's new page for April 2020

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Author: scottaddie

aspnetcore/whats-new/2019-10.md

@@ -0,0 +1,72 @@
+---
+title: "ASP.NET Core docs: What's new for April 2020"
+description: "What's new in ASP.NET Core docs for April 2020."
+ms.date: 05/01/2020
+---
+
+# ASP.NET Core docs: What's new for April 2020
+
+This article lists some of the significant changes to docs during this period.
+
+## Blazor
+
+### Updated articles
+
+- [Create and use ASP.NET Core Razor components](../blazor/components.md) - Surface warning/approach for component state
+- [ASP.NET Core Blazor hosting model configuration](../blazor/hosting-model-configuration.md) - Document Blazor WASM support for using configuration values in startup logic
+
+## gRPC
+
+### Updated articles
+
+- [Call gRPC services with the .NET client](../grpc/client.md) - Update gRPC client docs with trailer information
+
+## MVC
+
+### Updated articles
+
+- [Razor file compilation in ASP.NET Core](../mvc/views/view-compilation.md) - Adapt Razor runtime compilation guidance to changes made in ASP.NET Core 3.1
+
+## Security
+
+### Updated articles
+
+- [Add, download, and delete custom user data to Identity in an ASP.NET Core project](../security/authentication/add-user-data.md) - Adding additional claims to Identity
+- [ASP.NET Core Blazor authentication and authorization](../security/blazor/index.md) - Improvements to Blazor auth coverage
+- [Secure ASP.NET Core Blazor Server apps](../security/blazor/server.md) - Improvements to Blazor auth coverage
+- [ASP.NET Core Blazor WebAssembly additional security scenarios](../security/blazor/webassembly/additional-scenarios.md)
+  - Apply Blazor Preview 5 updates
+  - Move two Blazor WASM Overview sections
+- [Secure ASP.NET Core Blazor WebAssembly](../security/blazor/webassembly/index.md) - Improvements to Blazor auth coverage
+- [Enable Cross-Origin Requests (CORS) in ASP.NET Core](../security/cors.md)
+  - Rewrite entire doc and update for ASP.NET Core 3.1
+  - Provide links to Azure apps for testing CORS
+- [Client IP safelist for ASP.NET Core](../security/ip-safelist.md) - Update client IP address safelist doc and app for ASP.NET Core 3.1
+
+## SignalR
+
+### Updated articles
+
+- [ASP.NET Core SignalR configuration](../signalr/configuration.md) - Document the MinimumProtocolVersion property used for advanced SignalR HTTP configuration
+- [Use MessagePack Hub Protocol in SignalR for ASP.NET Core](../signalr/messagepackhubprotocol.md) - Update MessagePack docs for 5.0
+
+## Community contributors
+
+The following people have contributed to ASP.NET Core docs in April 2020. Thank you! You can learn how to contribute by following the links under "Get involved" in the [what's new landing page](index.yml).
+
+- [serpent5](https://github.com/serpent5) - Kirk Larkin (11)
+- [HamidMolareza](https://github.com/HamidMolareza) - Hamid Molareza (3)
+- [MelbourneDeveloper](https://github.com/MelbourneDeveloper) - Christian Findlay (3)
+- [inouiw](https://github.com/inouiw) - David New (2)
+- [kurtfurbush](https://github.com/kurtfurbush) - Kurt Furbush (2)
+- [rdeveen](https://github.com/rdeveen) - R. de Veen (2)
+- [wenhx](https://github.com/wenhx) - wenhx (2)
+- [brgrz](https://github.com/brgrz) - Marko Hrovatic (1)
+- [damienbod](https://github.com/damienbod) - damienbod (1)
+- [DrakeLambert](https://github.com/DrakeLambert) - Drake Lambert (1)
+- [kkbruce](https://github.com/kkbruce) - Bruce Chen (1)
+- [KyleMit](https://github.com/KyleMit) - Kyle (1)
+- [Marcel0024](https://github.com/Marcel0024) - Marcel (1)
+- [MohamedSahbi](https://github.com/MohamedSahbi) - Mohamed Sahbi (1)
+
+Want to contribute to the ASP.NET Core docs? Read our [contribution guidelines](https://github.com/dotnet/AspNetCore.Docs/blob/master/CONTRIBUTING.md).

aspnetcore/whats-new/2020-04.md

@@ -14,6 +14,8 @@ landingContent:
     linkLists:
       - linkListType: whats-new
         links:
+          - text: April 2020
+            url: 2020-04.md
           - text: March 2020
             url: 2020-03.md
           - text: February 2020
@@ -24,8 +26,6 @@ landingContent:
             url: 2019-12.md
           - text: November 2019
             url: 2019-11.md
-          - text: October 2019
-            url: 2019-10.md
 
   - title: "Get involved - contribute to ASP.NET Core docs"
     linkLists:

aspnetcore/whats-new/index.yml

@@ -5,6 +5,8 @@
     - name: 2020
       expanded: true
       items:
+      - name: April
+        href: 2020-04.md
       - name: March
         href: 2020-03.md
       - name: February
@@ -18,5 +20,3 @@
         href: 2019-12.md
       - name: November
         href: 2019-11.md
-      - name: October
-        href: 2019-10.md