Added initial indexer loop.  It pulls in discs correctly, but doesn't do anything else.
diff --git a/frc971/control_loops/index_main.cc b/frc971/control_loops/index_main.cc
new file mode 100644
index 0000000..cf18412
--- /dev/null
+++ b/frc971/control_loops/index_main.cc
@@ -0,0 +1,11 @@
+#include "frc971/control_loops/wrist.h"
+
+#include "aos/aos_core.h"
+
+int main() {
+  ::aos::Init();
+  frc971::control_loops::WristMotor wrist;
+  looper.Run();
+  ::aos::Cleanup();
+  return 0;
+}