Add debug_serial which can be used to read jevois serial messages with a PC.

Change-Id: I5d20bd4c5d55d7f0d04120731c6aad59e8c53dd5
diff --git a/y2019/vision/BUILD b/y2019/vision/BUILD
index f727d4b..c879eaa 100644
--- a/y2019/vision/BUILD
+++ b/y2019/vision/BUILD
@@ -69,6 +69,18 @@
     ],
 )
 
+cc_binary(
+    name = "debug_serial",
+    srcs = ["debug_serial.cc"],
+    deps = [
+        "//y2019/jevois:serial",
+        "//y2019/jevois:structures",
+        "//y2019/jevois:uart",
+         "//aos/logging",
+         "//aos/logging:implementations",
+    ],
+)
+
 """
 cc_binary(
     name = "calibration",