Add project files.

JSMR.Infrastructure/Data/Repositories/Circles/CircleCreatorsProvider.cs

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+using JSMR.Application.Circles.Queries.GetCreators;
+using Microsoft.EntityFrameworkCore;
+
+namespace JSMR.Infrastructure.Data.Repositories.Circles;
+
+public class CircleCreatorsProvider(AppDbContext context) : ICircleCreatorsProvider
+{
+    public async Task<GetCircleCreatorsResponse> HandleAsync(GetCircleCreatorsRequest request, CancellationToken cancellationToken = default)
+    {
+        int? circleId = await CircleLookup.ResolveCircleIdAsync(context, request.CircleId, request.NameOrMakerId, cancellationToken);
+
+        if (circleId is null)
+            return new GetCircleCreatorsResponse([]);
+
+        IQueryable<CircleCreatorItem> query =
+           from voiceWork in context.VoiceWorks.AsNoTracking()
+           where voiceWork.CircleId == circleId.Value
+           join voiceWorkCreator in context.VoiceWorkCreators.AsNoTracking() on voiceWork.VoiceWorkId equals voiceWorkCreator.VoiceWorkId
+           join creator in context.Creators.AsNoTracking() on voiceWorkCreator.CreatorId equals creator.CreatorId
+           group new { creator.Name, voiceWork.SalesDate, voiceWork.Downloads } by creator.Name into g
+           select new CircleCreatorItem(
+               g.Key,
+               g.Min(x => x.SalesDate),
+               g.Max(x => x.SalesDate),
+               g.Sum(x => x.Downloads ?? 0),
+               g.Count());
+
+        CircleCreatorItem[] items = await query
+            .OrderByDescending(x => x.Count)
+            .ThenByDescending(x => x.Downloads)
+            .ToArrayAsync(cancellationToken);
+
+        return new GetCircleCreatorsResponse(items);
+    }
+}