Add entityframework extension support

src/DotNetCore.CAP.MySql/ICapTransaction.MySql.cs

 using System.Data;
 using System.Diagnostics;
 using Microsoft.EntityFrameworkCore.Storage;
+using Microsoft.EntityFrameworkCore.Infrastructure;
 
 // ReSharper disable once CheckNamespace
 namespace DotNetCore.CAP
@@ -60,5 +61,13 @@ namespace DotNetCore.CAP
 
             return transaction;
         }
+
+        public static IDbContextTransaction BeginAndJoinToTransaction(this DatabaseFacade database,
+            ICapPublisher publisher, bool autoCommit = false)
+        {
+            var trans = database.BeginTransaction();
+            var capTrans = publisher.Transaction.Begin(trans);
+            return new CapEFDbTransaction(capTrans);
+        }
     }
 }
\ No newline at end of file

src/DotNetCore.CAP.MySql/IDbContextTransaction.CAP.cs

+using System;
+using DotNetCore.CAP;
+
+// ReSharper disable once CheckNamespace
+namespace Microsoft.EntityFrameworkCore.Storage
+{
+    internal class CapEFDbTransaction : IDbContextTransaction
+    {
+        private readonly ICapTransaction _transaction;
+
+        public CapEFDbTransaction(ICapTransaction transaction)
+        {
+            _transaction = transaction;
+            var dbContextTransaction = (IDbContextTransaction)_transaction.DbTransaction;
+            TransactionId = dbContextTransaction.TransactionId;
+        }
+
+        public void Dispose()
+        {
+            _transaction.Dispose();
+        }
+
+        public void Commit()
+        {
+            _transaction.Commit();
+        }
+
+        public void Rollback()
+        {
+            _transaction.Rollback();
+        }
+
+        public Guid TransactionId { get; }
+    }
+}