init lvgl code

LVGL.Simulator/lvgl/demos/stress/README.md

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+# Stress demo
+
+## Overview
+
+A stress test for LVGL.
+It contains a lot of object creation, deletion, animations, styles usage, and so on. It can be used if there is any memory corruption during heavy usage or any memory leaks.
+
+![Stress demo with LVGL embedded GUI library](https://github.com/lvgl/lvgl/tree/master/demos/stress/screenshot1.gif?raw=true)
+
+## Run the demo
+- In `lv_conf.h` or equivalent places set `LV_USE_DEMO_STRESS 1`
+- In `lv_conf.h` enable all the widgets (`LV_USE_BTN 1`) and the animations (`LV_USE_ANIMATION 1`)
+- After `lv_init()` and initializing the drivers call `lv_demo_stress()`