feature<Achive>: add git archive to commit's context menu

src/Commands/Archive.cs

@@ -0,0 +1,22 @@
+using System;
+
+namespace SourceGit.Commands {
+
+    /// <summary>
+    ///     存档命令
+    /// </summary>
+    public class Archive : Command {
+        private Action<string> handler;
+
+        public Archive(string repo, string revision, string to, Action<string> onProgress) {
+            Cwd = repo;
+            Args = $"archive --format=zip --verbose --output=\"{to}\" {revision}";
+            TraitErrorAsOutput = true;
+            handler = onProgress;
+        }
+
+        public override void OnReadline(string line) {
+            handler?.Invoke(line);
+        }
+    }
+}