init lvgl code

LVGL.Simulator/lvgl/examples/layouts/flex/index.rst

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+A simple row and a column layout with flexbox
+"""""""""""""""""""""""""""""""""""""""""""""""
+
+.. lv_example:: layouts/flex/lv_example_flex_1
+  :language: c
+
+Arrange items in rows with wrap and even spacing
+"""""""""""""""""""""""""""""""""""""""""""""""""
+
+.. lv_example:: layouts/flex/lv_example_flex_2
+  :language: c
+
+Demonstrate flex grow
+"""""""""""""""""""""""
+
+.. lv_example:: layouts/flex/lv_example_flex_3
+  :language: c
+
+Demonstrate flex grow.
+"""""""""""""""""""""""
+
+.. lv_example:: layouts/flex/lv_example_flex_4
+  :language: c
+
+Demonstrate column and row gap style properties
+"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+.. lv_example:: layouts/flex/lv_example_flex_5
+  :language: c
+
+RTL base direction changes order of the items
+"""""""""""""""""""""""""""""""""""""""""""""""
+
+.. lv_example:: layouts/flex/lv_example_flex_6
+  :language: c
+
+