Added some folders.

BufferControllers/APIThreadBuffer.cs

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+using NeDvachAPI.DBControllers;
+using NeDvachAPI.Models;
+
+namespace NeDvachAPI.BufferControllers
+{
+    public class APIThreadBuffer
+    {
+        private static List<Post> ThreadsPrewievs;
+        private static List<Post>[] Threads = new List<Post>[0];
+        public static void WriteThreadPreviewsBuffer(List<Post> OPPostsToWrite)    //add list of OP-posts and last post to buffer
+        {
+            ThreadsPrewievs = OPPostsToWrite;
+        }
+
+        public static List<Post> GetThreadPreviews()
+        {
+            return ThreadsPrewievs;
+        }
+
+        public static void WriteThreadsBuffer(List<Post> ThreadToAdd)  //add thread's posts from DB to buffer
+        {
+            Threads = Threads.Append(ThreadToAdd).ToArray();
+        }
+        public static List<Post> GetThread(int threadId)
+        {
+            if (threadId < Threads.Length + 1 & threadId != 0)
+            {
+                ;
+                return Threads[threadId - 1];
+
+            }
+            else return null;
+        }
+
+        public static void RefreshThread(int threadId)
+        {
+            Threads[threadId - 1] = DBchat.PostsList("b", threadId);
+        }
+
+    }
+}

BufferControllers/BufferFill.cs

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+using NeDvachAPI.DBControllers;
+using NeDvachAPI.Models;
+
+namespace NeDvachAPI.BufferControllers
+{
+    public class BufferFill
+    {
+
+        public static bool FillBuffer(string board) //method to get buffer of information, which is being ran while API is started
+        {
+            List<Post> posts = DBchat.ThreadsList(board);
+            APIThreadBuffer.WriteThreadPreviewsBuffer(posts);
+            Console.WriteLine("Заполняю буфер оп-постами");
+
+            for (int threadId = 1; threadId <= 4; threadId++)
+            {
+                APIThreadBuffer.WriteThreadsBuffer(DBchat.PostsList(board, threadId));
+                Console.WriteLine("Добавляю буферизую тред " + threadId);
+            }
+            return true;
+        }
+    }
+}