Start cleaning up account types

Application/Accounts/AccountReaderFactory.cs

@@ -0,0 +1,16 @@
+using System;
+
+namespace FeedCenter.Accounts;
+
+internal static class AccountReaderFactory
+{
+    internal static IAccountReader CreateAccountReader(Account account) =>
+        account.Type switch
+        {
+            AccountType.Miniflux => new MinifluxReader(account),
+            AccountType.Local => new LocalReader(account),
+            AccountType.Fever => new FeverReader(account),
+            AccountType.GoogleReader => new GoogleReaderReader(account),
+            _ => throw new NotSupportedException($"Account type '{account.Type}' is not supported."),
+        };
+}