add collection syncing

src/App/Repositories/CollectionRepository.cs

@@ -0,0 +1,21 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Bit.App.Abstractions;
+using Bit.App.Models.Data;
+
+namespace Bit.App.Repositories
+{
+    public class CollectionRepository : Repository<CollectionData, string>, ICollectionRepository
+    {
+        public CollectionRepository(ISqlService sqlService)
+            : base(sqlService)
+        { }
+
+        public Task<IEnumerable<CollectionData>> GetAllByUserIdAsync(string userId)
+        {
+            var folders = Connection.Table<CollectionData>().Where(f => f.UserId == userId).Cast<CollectionData>();
+            return Task.FromResult(folders);
+        }
+    }
+}