Add project files.

DiaryApp/Data/ApplicationDbContext.cs

@@ -0,0 +1,56 @@
+using DiaryApp.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace DiaryApp.Data
+{
+    public class ApplicationDbContext : DbContext
+    {
+        public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options) : base(options)
+        {
+        }
+        public DbSet<DiaryEntry> DiaryEntries { get; set; } = null!;
+
+        protected override void OnModelCreating(ModelBuilder modelBuilder)
+        {
+            base.OnModelCreating(modelBuilder);
+            modelBuilder.Entity<DiaryEntry>().HasData(
+                new DiaryEntry
+                {
+                    Id = 1,
+                    Title = "Went Hiking",
+                    Content = "Went hiking with Joe!",
+                    DateCreated = DateTime.Parse("2026-01-01 10:32")
+                },
+                new DiaryEntry
+                {
+                    Id = 2,
+                    Title = "Went Shoping",
+                    Content = "Went Shoping with Joe!",
+                    DateCreated = DateTime.Parse("2026-01-10 08:32")
+                },
+                new DiaryEntry
+                {
+                    Id = 3,
+                    Title = "Went Swimming",
+                    Content = "Went Swimming with Joe!",
+                    DateCreated = DateTime.Parse("2026-01-15 15:42")
+                },
+                new DiaryEntry
+                {
+                    Id = 4,
+                    Title = "Went Biking",
+                    Content = "Went Biking with Joe!",
+                    DateCreated = DateTime.Parse("2026-01-17 12:00")
+                }
+            );
+        }
+
+
+
+        // Four steps to add a table
+        // 1. Create a Model Class
+        // 2. Add DB-set
+        // 3. add-migration AddDiaryEntryTable
+        // 4. update-database
+    }
+}