docs: Add Styra OPA ASP.NET Core SDK integration.

Signed-off-by: Philip Conrad <philip@chariot-chaser.net>

docs/website/content/integrations/opa-aspnetcore.md

@@ -0,0 +1,21 @@
+---
+title: OPA ASP.NET Core SDK (Styra)
+labels:
+  category: application
+  layer: network
+code:
+- https://github.com/StyraInc/opa-aspnetcore
+- https://www.nuget.org/packages/Styra.Opa.AspNetCore
+tutorials:
+- https://styrainc.github.io/opa-aspnetcore/
+inventors:
+- styra
+software:
+- csharp
+---
+
+The Styra-supported OPA ASP.NET Core SDK enables seamless integration of Open
+Policy Agent and Enterprise OPA deployments with ASP.NET Core applications
+through an ASP.NET `Middleware` implementation. The SDK’s installation and usage
+details are provided on [NuGet](https://www.nuget.org/packages/Styra.Opa.AspNetCore).
+