Add the Auto-Submit label definition as well

The previous CL just granted access to the label, but didn't actually
define the label.

Change-Id: I3cffbe71a2492b2efeab15db37b432c8ca13cd46
Reviewed-on: https://dart-review.googlesource.com/c/All-Projects/+/150042
Reviewed-by: William Hesse <whesse@google.com>

project.config

diff --git a/project.config b/project.config
index dd506e4..56bd2c6 100644
--- a/project.config
+++ b/project.config
@@ -64,6 +64,15 @@
 	createTag = group mdb/dart-repo-team
 	createSignedTag = group Project Owners
 	createSignedTag = group mdb/dart-repo-team
+[label "Auto-Submit"]
+	function = NoBlock
+	defaultValue = 0
+	copyMinScore = true
+	copyMaxScore = true
+	copyAllScoresOnTrivialRebase = true
+	copyAllScoresIfNoCodeChange = true
+	value = 0 Do not send CL to CQ automatically after approval
+	value = +1 Send CL to CQ automatically after approval
 [label "Code-Review"]
 	function = MaxWithBlock
 	defaultValue = 0