add lec12 (very simple)

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diff --git a/lectures/lec12_bistability3 b/lectures/lec12_bistability3
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+
+This lecture is mostly a review of rate-feedback plots, and advice on how to
+plot them in MATLAB.
+
+Lots of nitty-gritty plotting tricks.
+
+Crude zero-finding with min(abs(y1 - y2)), which, for vectors y1, y2, returns a
+tuple of (value, index). Later, instead go pairwise along vector of
+differences, and add pairs for every crossing.
+