Initial commit carried over from private repo. This is V2.

code/MessengerApi.Db/Repositories/Repository.cs

@@ -0,0 +1,26 @@
+using MessengerApi.Db.Contracts.Entities;
+using MessengerApi.Db.Contracts.Repositories;
+using Microsoft.EntityFrameworkCore;
+
+namespace MessengerApi.Db.Repositories
+{
+    public abstract class Repository<T> : IRepository<T> where T : class, IEntity<T>
+    {
+        protected readonly DbSet<T> db;
+
+        public Repository(DbSet<T> db)
+        {
+            this.db = db;
+        }
+
+        public void Add(T entity)
+        {
+            this.db.Add(entity);
+        }
+
+        public T GetById(Guid id)
+        {
+            return this.db.Single(x => x.Id == id);
+        }
+    }
+}