fix(DagApi): put JSON stream

src/CoreApi/IDagApi.cs

@@ -1,6 +1,7 @@
 using Newtonsoft.Json.Linq;
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
@@ -20,7 +21,7 @@ namespace Ipfs.CoreApi
     public interface IDagApi
     {
         /// <summary>
-        ///  Put an IPLD node.
+        ///  Put JSON data as an IPLD node.
         /// </summary>
         /// <param name="data">
         ///   The JSON data to send to the network.
@@ -50,6 +51,37 @@ Task<Cid> PutAsync(
             bool pin = true,
             CancellationToken cancel = default(CancellationToken));
 
+        /// <summary>
+        ///  Put a stream JSON data as an IPLD node.
+        /// </summary>
+        /// <param name="data">
+        ///   The stream of JSON.
+        /// </param>
+        /// <param name="contentType">
+        ///   The content type or format of the <paramref name="data"/>; such as "raw" or "cbor".
+        ///   See <see cref="MultiCodec"/> for more details.  Defaults to "cbor".
+        /// </param>
+        /// <param name="multiHash">
+        ///   The <see cref="MultiHash"/> algorithm name used to produce the <see cref="Cid"/>.
+        /// </param>
+        /// <param name="pin">
+        ///   If <b>true</b> the <paramref name="data"/> is pinned to local storage and will not be
+        ///   garbage collected.  The default is <b>true</b>.
+        /// </param>
+        /// <param name="cancel">
+        ///   Is used to stop the task.  When cancelled, the <see cref="TaskCanceledException"/> is raised.
+        /// </param>
+        /// <returns>
+        ///   A task that represents the asynchronous put operation. The task's value is
+        ///   the data's <see cref="Cid"/>.
+        /// </returns>
+        Task<Cid> PutAsync(
+            Stream data,
+            string contentType = "cbor",
+            string multiHash = MultiHash.DefaultAlgorithmName,
+            bool pin = true,
+            CancellationToken cancel = default(CancellationToken));
+
         /// <summary>
         ///   Get an IPLD node.
         /// </summary>