initial commit of source

src/Core/Repositories/IRepository.cs

@@ -0,0 +1,14 @@
+using System.Threading.Tasks;
+
+namespace Bit.Core.Repositories
+{
+    public interface IRepository<T> where T : IDataObject
+    {
+        Task<T> GetByIdAsync(string id);
+        Task CreateAsync(T obj);
+        Task ReplaceAsync(T obj);
+        Task UpsertAsync(T obj);
+        Task DeleteByIdAsync(string id);
+        Task DeleteAsync(T obj);
+    }
+}