Add helpful links to `codegen --help`

Test: ensure links/email are clickable in terminal
Change-Id: I2d9461e98497b8a2af21b0a48ae05c5c110c8484
diff --git a/tools/codegen/src/com/android/codegen/Main.kt b/tools/codegen/src/com/android/codegen/Main.kt
index 5804674..fcf1f82 100755
--- a/tools/codegen/src/com/android/codegen/Main.kt
+++ b/tools/codegen/src/com/android/codegen/Main.kt
@@ -95,7 +95,13 @@
       you can use with final fields.
 
 Version: $CODEGEN_VERSION
-Questions? Feedback? Contact: eugenesusla@
+
+Questions? Feedback?
+Contact: eugenesusla@
+Bug/feature request: http://go/codegen-bug
+
+Slides: http://go/android-codegen
+In-depth example: http://go/SampleDataClass
 """
 
 fun main(args: Array<String>) {