🚧 Core API and abstractions extending

Core/Extensions/RepositoryExtension.cs

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+using Microsoft.EntityFrameworkCore;
+
+namespace Kruzya.TelegramBot.Core.Extensions
+{
+    public static class RepositoryExtension
+    {
+        #region DbContext
+
+        /// <summary>
+        /// Marks the entity as created.
+        /// </summary>
+        /// <param name="dbContext"></param>
+        /// <param name="entity">Entity for marking as created.</param>
+        public static void MarkAsCreated(this DbContext dbContext, object entity) =>
+            dbContext.Entry(entity).State = EntityState.Added;
+
+        /// <summary>
+        /// Marks the entity as deleted.
+        /// </summary>
+        /// <param name="dbContext"></param>
+        /// <param name="entity">Entity for marking as deleted.</param>
+        public static void MarkAsDeleted(this DbContext dbContext, object entity) =>
+            dbContext.Entry(entity).State = EntityState.Deleted;
+
+        /// <summary>
+        /// Marks the entity as modified.
+        /// </summary>
+        /// <param name="dbContext"></param>
+        /// <param name="entity">Entity for marking as modified.</param>
+        public static void MarkAsModified(this DbContext dbContext, object entity) =>
+            dbContext.Entry(entity).State = EntityState.Modified;
+
+        #endregion
+
+        #region Repository
+
+        public static TEntity Create<TEntity>(this DbSet<TEntity> repository) where TEntity : class, new()
+        {
+            var entity = new TEntity();
+            repository.Add(entity);
+
+            return entity;
+        }
+
+        #endregion
+    }
+}

Core/Extensions/StartupExtension.cs

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+using System.Collections.Concurrent;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Kruzya.TelegramBot.Core.Extensions
+{
+    public static class StartupExtension
+    {
+        public static IServiceCollection AddQueue<T>(this IServiceCollection collection)
+        {
+            return collection.AddSingleton<ConcurrentQueue<T>>();
+        }
+    }
+}