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/galactic_search_path.fbs b/y2020/vision/galactic_search_path.fbs
new file mode 100644
index 0000000..d1e1223
--- /dev/null
+++ b/y2020/vision/galactic_search_path.fbs
@@ -0,0 +1,22 @@
+namespace y2020.vision;
+
+enum Alliance : byte {
+  kRed,
+  kBlue,
+  kUnknown
+}
+
+enum Letter : byte {
+  kA,
+  kB
+}
+
+table GalacticSearchPath {
+  // Alliance of the path
+  alliance:Alliance (id: 0);
+
+  // Letter of the path
+  letter:Letter (id: 1);
+}
+
+root_type GalacticSearchPath;