init lvgl code

LVGL.Simulator/lvgl/docs/requirements.txt

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+alabaster==0.7.12
+Babel==2.9.1
+breathe==4.30.0
+certifi==2020.12.5
+chardet==4.0.0
+commonmark==0.9.1
+docutils==0.16
+idna==2.10
+imagesize==1.2.0
+importlib-metadata==4.0.1
+Jinja2==2.11.3
+Markdown==3.3.4
+MarkupSafe==1.1.1
+packaging==20.9
+Pygments==2.9.0
+pyparsing==2.4.7
+pytz==2021.1
+recommonmark==0.6.0
+requests==2.25.1
+six==1.16.0
+snowballstemmer==2.1.0
+Sphinx==4.0.1
+sphinx-markdown-tables==0.0.15
+sphinx-rtd-theme==0.5.2
+sphinx-sitemap==2.2.0
+sphinxcontrib-applehelp==1.0.2
+sphinxcontrib-devhelp==1.0.2
+sphinxcontrib-htmlhelp==1.0.3
+sphinxcontrib-jsmath==1.0.1
+sphinxcontrib-qthelp==1.0.3
+sphinxcontrib-serializinghtml==1.1.4
+typing-extensions==3.10.0.0
+urllib3==1.26.5
+zipp==3.4.1