More docs

Author: veblush

README.md

@@ -15,12 +15,25 @@ Position of tone mark, upper vowel and lower vowel would be adjusted by surround
 Visit [Release](https://github.com/SaladbowlCreative/Unity3D.ThaiFontAdjuster/releases)
 page to get latest ThaiFontAdjuster unity-package.
 
+## How to use
+
+Just before setting text of UnityEngine.UI.Text, text need to be translated by
+`ThaiFontAdjuster.Adjust`. Font of Text should be one of supported Thai fonts.
+
+```csharp
+var s = "Thai ก์กิ์ป์ปิ์ฎุญุ";
+Label.text = ThaiFontAdjuster.Adjust(s);
+```
+
+For other UI library using Unity3D dynamic font (like NGUI), you can do it by same way.
+
 ## Limitation
 
 - ThaiFontAdjuster only can handle specific fonts.
   - Font should have extended glyphs from U+F700 to U+F71A providing various position of Thai characters.
   - [NECTEC National Fonts](http://www.nectec.or.th/pub/review-software/font/national-fonts.html) (Garuda, Loma, Kinnari, Norasi) already provide it.
   - Extended NotoSansThai-Regular for being supported is included in this package.
+  - If you want to use another font, check it contains extended glyphs otherwise these glyphs have to be added.
 - Adjusting position is not same as true-type rendering with GPOS and GSUB support.
   - This library adjusts position of glyph at best with limited extended set of character.
     But without GPOS, ideal positioning is impossibe.