[python] Stub a matplotlib module

python/port/mod/matplotlib/modpyplot.cpp

@@ -0,0 +1,17 @@
+extern "C" {
+#include "modpyplot.h"
+}
+#include "port.h"
+#include "plot_controller.h"
+
+Matplotlib::PlotController sPlotController;
+
+mp_obj_t modpyplot_plot(mp_obj_t x, mp_obj_t y) {
+  // Ensure x and y are arrays
+  // "Push" x and y on bigger arrays
+}
+
+mp_obj_t modpyplot_show() {
+  MicroPython::ExecutionEnvironment * env = MicroPython::ExecutionEnvironment::currentExecutionEnvironment();
+  env->displayViewController(&sPlotController);
+}