Add initial database context and first entity

Component/Entry/Repository/Entry.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Diary.Component.Entry.Repository
+{
+	[Table("Entries", Schema = "Diary")]
+	public class Entry
+	{
+		[Key]
+		public int EnrtyID { get; set; }
+
+		[Required]
+		[Column(TypeName="Date")]
+		public DateTime Date { get; set; }
+
+		[Required]
+		public DateTime ValidFrom { get; set; }
+		public DateTime? ValidTo { get; set; }
+
+		public string Note { get; set; } 
+
+
+	}
+}

Component/Entry/Repository/EntryConfiguration.cs

@@ -0,0 +1,13 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Builders;
+
+namespace Diary.Component.Entry.Repository
+{
+	public class EntryConfiguration : IEntityTypeConfiguration<Entry>
+	{
+		public void Configure(EntityTypeBuilder<Entry> builder)
+		{
+			
+		}
+	}
+}