Add project files.

ConstructorApp.DataAccessLayer/Repositories/GenericRepository.cs

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+using ConstructorApp.DataAccessLayer.Abstract;
+using ConstructorApp.DataAccessLayer.Concrete;
+using Microsoft.EntityFrameworkCore;
+
+namespace ConstructorApp.DataAccessLayer.Repositories
+{
+    public class GenericRepository<T> : IGenericDal<T> where T : class
+    {
+        private readonly ConstructorContext _context;
+
+        public GenericRepository(ConstructorContext context)
+        {
+            _context = context;
+        }
+
+        public void Add(T entity)
+        {
+            _context.Add(entity);
+            _context.SaveChanges();
+        }
+
+        public void Delete(T entity)
+        {
+            _context.Remove(entity);
+            _context.SaveChanges();
+        }
+
+        public T GetByID(int id)
+        {
+            return _context.Set<T>().Find(id);
+        }
+
+        public List<T> GetListAll()
+        {
+            return _context.Set<T>().ToList();
+        }
+
+        public async Task<List<T>> GetListAllAsync()
+        {
+            return await _context.Set<T>().ToListAsync();
+        }
+
+        public void Update(T entity)
+        {
+            _context.Update(entity);
+            _context.SaveChanges();
+        }
+    }
+}