Add shooter class and python.

Change-Id: I27b4c8f282a0b80344a7df59cf3b04569d9c8110
diff --git a/y2020/control_loops/superstructure/finisher/BUILD b/y2020/control_loops/superstructure/finisher/BUILD
new file mode 100644
index 0000000..b9bfc4f
--- /dev/null
+++ b/y2020/control_loops/superstructure/finisher/BUILD
@@ -0,0 +1,17 @@
+package(default_visibility = ["//visibility:public"])
+
+load("@com_github_google_flatbuffers//:build_defs.bzl", "flatbuffer_cc_library")
+
+genrule(
+    name = "genrule_finisher",
+    outs = [
+        "finisher_plant.h",
+        "finisher_plant.cc",
+        "finisher_integral_plant.h",
+        "finisher_integral_plant.cc",
+    ],
+    cmd = "$(location //y2020/control_loops/python:finisher) $(OUTS)",
+    tools = [
+        "//y2020/control_loops/python:finisher",
+    ],
+)