init lvgl code

LVGL.Simulator/lvgl/.github/pull_request_template.md

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+### Description of the feature or fix
+
+A clear and concise description of what the bug or new feature is.
+
+### Checkpoints
+- [ ] Follow the [styling guide](https://github.com/lvgl/lvgl/blob/master/docs/CODING_STYLE.md)
+- [ ] Run `code-format.py` from the `scripts` folder. [astyle](http://astyle.sourceforge.net/install.html) needs to be installed.
+- [ ] Update the documentation