add sample to create revert

ClientLibrary/Snippets/Microsoft.TeamServices.Samples.Client/Git/RevertsSample.cs

@@ -0,0 +1,58 @@
+using Microsoft.TeamFoundation.SourceControl.WebApi;
+using Microsoft.VisualStudio.Services.WebApi;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Microsoft.TeamServices.Samples.Client.Git
+{
+    [ClientSample(GitWebApiConstants.AreaName, "reverts")]
+    public class RevertsSample : ClientSample
+    {
+        [ClientSampleMethod]
+        public GitRevert CreateRevert()
+        {
+            VssConnection connection = this.Context.Connection;
+            GitHttpClient gitClient = connection.GetClient<GitHttpClient>();
+
+            Guid projectId = ClientSampleHelpers.FindAnyProject(this.Context).Id;
+            GitRepository repo = GitSampleHelpers.FindAnyRepository(this.Context, projectId);
+
+            // find the latest commit on master
+            GitCommitRef latestCommitOnMaster = gitClient.GetCommitsAsync(repo.Id, new GitQueryCommitsCriteria()
+            {
+                ItemVersion = new GitVersionDescriptor()
+                {
+                    Version = "master",
+                    VersionType = GitVersionType.Branch
+                },
+                Top = 1
+            }).Result.First();
+
+            // generate a unique name to suggest for the branch
+            string suggestedBranchName = "refs/heads/vsts-dotnet-samples/" + GitSampleHelpers.ChooseRefsafeName();
+
+            // revert it relative to master
+            GitRevert revert = gitClient.CreateRevertAsync(
+                new GitAsyncRefOperationParameters()
+                {
+                    OntoRefName = "refs/heads/master",
+                    GeneratedRefName = suggestedBranchName,
+                    Repository = repo,
+                    Source = new GitAsyncRefOperationSource()
+                    {
+                        CommitList = new GitCommitRef[] { new GitCommitRef() { CommitId = latestCommitOnMaster.CommitId } }
+                    },
+                },
+                projectId,
+                repo.Id).Result;
+
+            Console.WriteLine("Revert {0} created", revert.RevertId);
+
+            // typically, the next thing you'd do is create a PR for this revert
+            return revert;
+        }
+    }
+}