Copied drivetrain from y2018 to y2019

Also verified that
bazel run :drivetrain  -- --plot
works for the y2019 version.

Change-Id: I71ef201c66005e9636894d8bbfb9491ee2b4f6d4
diff --git a/y2019/BUILD b/y2019/BUILD
new file mode 100644
index 0000000..49ae5a5
--- /dev/null
+++ b/y2019/BUILD
@@ -0,0 +1,5 @@
+py_library(
+    name = "python_init",
+    srcs = ["__init__.py"],
+    visibility = ["//visibility:public"],
+)