Added icons for iOS. Broke out data access into repositories. Added syncing service.

src/App/Abstractions/Repositories/IRepository.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace Bit.App.Abstractions
+{
+    public interface IRepository<T, TId>
+        where T : class, IDataObject<TId>, new()
+        where TId : IEquatable<TId>
+    {
+        Task<T> GetByIdAsync(TId id);
+        Task<IEnumerable<T>> GetAllAsync();
+        Task UpdateAsync(T obj);
+        Task InsertAsync(T obj);
+        Task DeleteAsync(TId id);
+        Task DeleteAsync(T obj);
+    }
+}