Added Entry initial repo and services for a create action.

Component/Entries/Repository/EntryRepository.cs

@@ -0,0 +1,26 @@
+using Diary.Data;
+
+namespace Diary.Component.Entries.Repository
+{
+	public interface IEntryRepository
+	{
+		Task<Entry> CreateAsync(Entry entry);
+	}
+
+
+	public class EntryRepository : IEntryRepository
+	{
+		private readonly IDiaryDBContext _diaryDbContext;
+
+		public EntryRepository(IDiaryDBContext diaryDbContext)
+		{
+			_diaryDbContext = diaryDbContext ?? throw new ArgumentNullException(nameof(diaryDbContext));
+		}
+
+		public async Task<Entry> CreateAsync(Entry entry)
+		{
+			await _diaryDbContext.Entries.AddAsync(entry);
+			return entry;
+		}
+	}
+}