feat(libs): add SVG rendering support (#6845)

Signed-off-by: zhangjipeng <zhangjipeng@xiaomi.com>
Co-authored-by: zhangjipeng <zhangjipeng@xiaomi.com>

docs/libs/svg.rst

@@ -0,0 +1,49 @@
+.. _svg:
+
+==============
+SVG support
+==============
+
+Scalable Vector Graphics (SVG) Tiny 1.2 support in LVGL.
+
+Detailed introduction: https://www.w3.org/TR/SVGTiny12/
+
+Usage
+-----
+
+Enable :c:macro:`LV_USE_SVG` in ``lv_conf.h``.
+
+See the examples below.
+
+If you need support SVG animation attribute parsing, 
+you can enable :c:macro:`LV_USE_SVG_ANIMATION` in ``lv_conf.h``.
+
+.. _svg_example:
+
+Example
+-------
+
+.. include:: ../examples/libs/svg/index.rst
+
+.. code:: c
+
+    lv_svg_node_t * svg_doc;
+    const char* svg_data = "<svg><rect x=\"0\" y=\"0\" width=\"100\" height=\"100\"/></svg>";
+
+    /* Create an SVG DOM tree*/
+    svg_doc = lv_svg_load_data(svg_data, svg_len); 
+    ...
+
+    /* Draw SVG image*/
+    lv_draw_svg(layer, svg_doc);
+    ...
+
+    /* Release the DOM tree*/
+    lv_svg_node_delete(svg_doc);
+
+.. _svg_api:
+
+API
+---
+
+