project.config: add Trust label

Change-Id: I5a34fac9268369f6988bbba14bb48f9ce1995a53
Reviewed-on: https://go-review.googlesource.com/c/All-Projects/+/254417
Reviewed-by: Andrew Bonventre <andybons@google.com>

project.config

diff --git a/project.config b/project.config
index e7fd144..f31eb58 100644
--- a/project.config
+++ b/project.config
@@ -55,6 +55,12 @@
 	value = 0 No score
 	value = +1 Looks good to me, but someone else must approve
 	value = +2 Looks good to me, approved
+[label "Trust"]
+	function = NoBlock
+	defaultValue = 0
+	copyMaxScore = true
+	value = 0 Untrusted
+	value = +1 Trusted
 [label "Run-TryBot"]
 	function = NoBlock
 	defaultValue = 0