feat: Initialize Strata KitchenSink application boilerplate

This sets up the foundational structure for a .NET Core 6 / React project,
demonstrating common architectural patterns, Docker integration, and key
Strata libraries for API, data access (EF Core), background jobs (Hangfire),
real-time communication (SignalR), and various frontend UI components.

nuget.config

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+    <config>
+        <add key="defaultPushSource" value="https://proget.ops.stratanetwork.net/nuget/nuget" />
+    </config>
+    <packageSources>
+        <add key="NuGet official package source" value="https://api.nuget.org/v3/index.json" />
+        <add key="Strata package source" value="https://proget.ops.stratanetwork.net/nuget/nuget" />
+    </packageSources>
+</configuration>