add examples/lvgl/lv_png.py.

Signed-off-by: 李昂 <liang6516@outlook.com>

examples/lvgl/lv_png.py

@@ -0,0 +1,16 @@
+import lvgl as lv
+
+f = open('/pikafs/1.png', 'rb')
+img_data = f.read()
+f.close()  
+
+   
+img_dsc = lv.img_dsc_t({
+    "data_size": len(img_data),
+    "data": img_data,
+})
+
+img = lv.img(lv.scr_act())
+img.set_zoom(500)
+img.align(lv.ALIGN.CENTER, 0, -20)
+img.set_src(img_dsc)