Initial split of the modules

NadekoBot.Core/Services/Impl/StartingGuildsListService.cs

@@ -0,0 +1,24 @@
+using Discord.WebSocket;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Linq;
+using System.Collections;
+
+namespace NadekoBot.Services.Impl
+{
+    public class StartingGuildsService : IEnumerable<long>, INService
+    {
+        private readonly ImmutableList<long> _guilds;
+
+        public StartingGuildsService(DiscordSocketClient client)
+        {
+            this._guilds = client.Guilds.Select(x => (long)x.Id).ToImmutableList();
+        }
+
+        public IEnumerator<long> GetEnumerator() =>
+            _guilds.GetEnumerator();
+
+        IEnumerator IEnumerable.GetEnumerator() =>
+            _guilds.GetEnumerator();
+    }
+}