Adding a simple codelab. Hopefully this can be useful in training.

Change-Id: I3bab489d66969e78fd527c7f8f4361228bb20be9
diff --git a/frc971/codelab/basic.q b/frc971/codelab/basic.q
new file mode 100644
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+++ b/frc971/codelab/basic.q
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+package frc971.codelab;
+
+import "aos/common/controls/control_loops.q";
+import "frc971/control_loops/control_loops.q";
+
+// The theme of this basic test is a simple intake system.
+//
+// The system will have a motor driven by the voltage returned
+// by output, and then eventually this motor, when run enough,
+// will trigger the limit_sensor. The hypothetical motor should shut
+// off in that hypothetical situation to avoid hypothetical burnout.
+queue_group BasicQueue {
+  implements aos.control_loops.ControlLoop;
+
+  message Goal {
+    // The control loop needs to intake now.
+    bool intake;
+  };
+
+  message Position {
+    // This is a potential incoming sensor value letting us know
+    // if we need to be intaking.
+    bool limit_sensor;
+  };
+
+  message Status {
+    // Lets consumers of basic_queue.status know if
+    // the requested intake is finished.
+    bool intake_complete;
+  };
+
+  message Output {
+    // This would be set up to drive a hypothetical motor that would
+    // hope to intake something.
+    double intake_voltage;
+  };
+
+  queue Goal goal;
+  queue Position position;
+  queue Output output;
+  queue Status status;
+};
+
+queue_group BasicQueue basic_queue;