Add flatbuffer schema for galatic search challenge path

The flatbuffer will be send on the /camera channel indicating the path on the field so that the correct spline can be run.

Change-Id: I661725f1e1ebd31b1316bc7a6ed12a6356a3a1dd
diff --git a/y2020/vision/BUILD b/y2020/vision/BUILD
index a5d47fa..187dedc 100644
--- a/y2020/vision/BUILD
+++ b/y2020/vision/BUILD
@@ -9,6 +9,14 @@
     visibility = ["//y2020:__subpackages__"],
 )
 
+flatbuffer_cc_library(
+    name = "galactic_search_path_fbs",
+    srcs = ["galactic_search_path.fbs"],
+    gen_reflections = 1,
+    target_compatible_with = ["@platforms//os:linux"],
+    visibility = ["//y2020:__subpackages__"],
+)
+
 cc_library(
     name = "v4l2_reader",
     srcs = [