Added shooter loop.

Still needs to actually be tested and tuned on a robot. Passes all of its tests.
diff --git a/frc971/control_loops/shooter_main.cc b/frc971/control_loops/shooter_main.cc
new file mode 100644
index 0000000..94b8d59
--- /dev/null
+++ b/frc971/control_loops/shooter_main.cc
@@ -0,0 +1,5 @@
+#include "frc971/control_loops/shooter.h"
+
+#include "aos/aos_core.h"
+
+AOS_RUN_LOOP(frc971::control_loops::ShooterMotor);