[WIP] Add new Project API Preview (#1480)

Add Projects API client (preview)

Octokit/Http/Connection.cs

@@ -222,6 +222,14 @@ namespace Octokit
             return response.HttpResponse.StatusCode;
         }
 
+        public async Task<HttpStatusCode> Post(Uri uri, object body, string accepts)
+        {
+            Ensure.ArgumentNotNull(uri, "uri");
+
+            var response = await SendData<object>(uri, HttpMethod.Post, body, accepts, null, CancellationToken.None).ConfigureAwait(false);
+            return response.HttpResponse.StatusCode;
+        }
+
         public Task<IApiResponse<T>> Post<T>(Uri uri)
         {
             Ensure.ArgumentNotNull(uri, "uri");

Octokit/Http/IConnection.cs

@@ -96,9 +96,18 @@ namespace Octokit
         /// Performs an asynchronous HTTP POST request.
         /// </summary>
         /// <param name="uri">URI endpoint to send request to</param>
-        /// <returns><seealso cref="IResponse"/> representing the received HTTP response</returns>
+        /// <returns>The returned <seealso cref="HttpStatusCode"/></returns>
         Task<HttpStatusCode> Post(Uri uri);
 
+        /// <summary>
+        /// Performs an asynchronous HTTP POST request.
+        /// </summary>
+        /// <param name="uri">URI endpoint to send request to</param>
+        /// <param name="body">The object to serialize as the body of the request</param>
+        /// <param name="accepts">Specifies accepted response media types.</param>
+        /// <returns>The returned <seealso cref="HttpStatusCode"/></returns>
+        Task<HttpStatusCode> Post(Uri uri, object body, string accepts);
+
         /// <summary>
         /// Performs an asynchronous HTTP POST request.
         /// Attempts to map the response body to an object of type <typeparamref name="T"/>