Added interfaces to read and write data in DB and added DbContext implementing these

SchengenVisaApi/Infrastructure/Database/DbContext.cs

@@ -0,0 +1,45 @@
+using System.Reflection;
+using Domains;
+using Microsoft.EntityFrameworkCore;
+
+namespace Infrastructure.Database
+{
+    public class DbContext : Microsoft.EntityFrameworkCore.DbContext, IWriter, IReader, IUnitOfWork
+    {
+        protected override void OnModelCreating(ModelBuilder modelBuilder)
+        {
+            modelBuilder.ApplyConfigurationsFromAssembly(Assembly.GetExecutingAssembly());
+        }
+
+        async Task IWriter.AddAsync<T>(T entity, CancellationToken cancellationToken)
+        {
+            await AddAsync(entity, cancellationToken);
+        }
+
+        void IWriter.Update<T>(T entity)
+        {
+            Update(entity);
+        }
+
+        void IWriter.Remove<T>(T entity)
+        {
+            Remove(entity);
+        }
+
+        IQueryable<T> IReader.GetAll<T>()
+        {
+            return Set<T>();
+        }
+
+        async Task<T?> IReader.GetOneAsync<T>(Guid id, CancellationToken cancellationToken)
+            where T : class
+        {
+            return await Set<T>().FindAsync([id], cancellationToken: cancellationToken);
+        }
+
+        async Task IUnitOfWork.SaveAsync(CancellationToken cancellationToken)
+        {
+            await SaveChangesAsync(cancellationToken);
+        }
+    }
+}