ADD: added attributes for estimated and working time

lib/Git/IssueManager/Issue.pm

@@ -260,6 +260,32 @@ id of the issue
 =cut
 has 'id' => (is => 'rw', isa => 'Str', default => "");
 
+=attr estimated_time
+
+The estimated time for solving this issue in B<Minutes>
+
+Default value is B<0>, meaning no estimate set.
+
+=cut
+has 'estimated_time' (is => 'rw', isa => 'Num', default => 0, trigger => sub {
+            my ($self, $new, $old) = @_;
+
+            die("unknown value (" . $new . ")") unless $new > 0;
+});
+
+=attr working_time
+
+The current time in B<Minutes> already spent on this issue
+
+The default value is B<0>.
+
+=cut
+has 'working_time' => (is => 'rw', isa=>'Num', default => 0, rigger => sub {
+            my ($self, $new, $old) = @_;
+
+            die("unknown value (" . $new . ")") unless $new > 0;
+});
+
 
 =method addTag
 
@@ -503,7 +529,21 @@ sub createIssue
             };
   push(@tree, $worker);
 
+  my $estimated   = {
+              path => "estimated",
+              ref  => $repository->createFileObject($self->estimated_time),
+              type => "blob",
+              mode => "100644"
+            };
+  push(@tree, $estimated);
 
+  my $working_time   = {
+              path => "working",
+              ref  => $repository->createFileObject($self->working_time),
+              type => "blob",
+              mode => "100644"
+            };
+  push(@tree, $working_time);
 
   my $tags          = {
               path => "tags",