Update README.md

Author: ocornut

README.md

@@ -36,7 +36,14 @@ Gallery
 ![screenshot 4](/web/test_window_04.png?raw=true)
 ![screenshot 4](/web/examples_02.png?raw=true)
 
-ImGui can load TTF fonts. UTF-8 is supported for text display and input. Here using Arial Unicode font to display Japanese:
+ImGui can load TTF fonts. UTF-8 is supported for text display and input. Here using Arial Unicode font to display Japanese. Initialize custom font with:
+
+```
+    ImGuiIO& io = ImGui::GetIO();
+    io.Fonts->AddFontFromFileTTF("ArialUni.ttf", 18.0f, io.Fonts->GetGlyphRangesJapanese());
+
+```
+![Japanese screenshot](/web/code_sample_01_jp.png?raw=true)
 
 ![utf-8 screenshot](/web/utf8_sample_01.png?raw=true)