Add missing IDataSeedContributor

framework/src/Volo.Abp.Data/Volo/Abp/Data/IDataSeedContributor.cs

@@ -0,0 +1,9 @@
+using System.Threading.Tasks;
+
+namespace Volo.Abp.Data
+{
+    public interface IDataSeedContributor
+    {
+        Task SeedAsync(DataSeedContext context);
+    }
+}