Introduce Feedser plugin scaffolding

src/StellaOps.Feedser/StellaOps.Feedser.Source.Acsc/Class1.cs

@@ -0,0 +1,28 @@
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+using StellOps.AddOn;
+
+namespace StellaOps.Feedser.Source.Acsc;
+
+public sealed class AcscConnectorPlugin : IConnectorPlugin
+{
+    public string Name => "acsc";
+
+    public bool IsAvailable(IServiceProvider services) => true;
+
+    public IFeedConnector Create(IServiceProvider services) => new StubConnector(Name);
+
+    private sealed class StubConnector : IFeedConnector
+    {
+        public StubConnector(string sourceName) => SourceName = sourceName;
+
+        public string SourceName { get; }
+
+        public Task FetchAsync(IServiceProvider services, CancellationToken cancellationToken) => Task.CompletedTask;
+
+        public Task ParseAsync(IServiceProvider services, CancellationToken cancellationToken) => Task.CompletedTask;
+
+        public Task MapAsync(IServiceProvider services, CancellationToken cancellationToken) => Task.CompletedTask;
+    }
+}