Create the y2021_bot3 folder

It builds! yay

Change-Id: I732955c018ce2988de64486e2457e673efd2cbb8
diff --git a/y2021_bot3/control_loops/python/BUILD b/y2021_bot3/control_loops/python/BUILD
new file mode 100644
index 0000000..7ade878
--- /dev/null
+++ b/y2021_bot3/control_loops/python/BUILD
@@ -0,0 +1,45 @@
+package(default_visibility = ["//y2021_bot3:__subpackages__"])
+
+py_binary(
+    name = "drivetrain",
+    srcs = [
+        "drivetrain.py",
+    ],
+    target_compatible_with = ["@platforms//cpu:x86_64"],
+    deps = [
+        "//external:python-gflags",
+        "//external:python-glog",
+        "//frc971/control_loops/python:drivetrain",
+    ],
+)
+
+py_binary(
+    name = "polydrivetrain",
+    srcs = [
+        "drivetrain.py",
+        "polydrivetrain.py",
+    ],
+    target_compatible_with = ["@platforms//cpu:x86_64"],
+    deps = [
+        "//external:python-gflags",
+        "//external:python-glog",
+        "//frc971/control_loops/python:polydrivetrain",
+    ],
+)
+
+py_library(
+    name = "polydrivetrain_lib",
+    srcs = [
+        "drivetrain.py",
+        "polydrivetrain.py",
+    ],
+    target_compatible_with = ["@platforms//cpu:x86_64"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//external:python-gflags",
+        "//external:python-glog",
+        "//frc971/control_loops/python:controls",
+        "//frc971/control_loops/python:drivetrain",
+        "//frc971/control_loops/python:polydrivetrain",
+    ],
+)