Release notes for 3.2.1

RELEASE-NOTES.md

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 # Release Notes
 
+## Version 3.2.1
+
+The MiniGUI development team announces the availability of MiniGUI 3.2.1.
+All users of MiniGUI are recommended strongly to use this version.
+Please report any bugs and incompatibilities in
+
+    https://github.com/VincentWei/minigui. 
+
+### What's new in this version
+
+* ENHANCEMENTS:
+
+  1. New API: SyncUpdateDC (). You can use this function to synchronize 
+    the update rectangles of a surface to screen, if the surface
+    represents the shadow frame buffer of the screen.
+
+    configure option: --enable-syncupdate
+    macro: _MGUSE_SYNC_UPDATE
+
+  1. Use different colors for the output of `_DBG_PRINTF` and `_ERR_PRINTF`.
+
+  1. add `__mg_save_jpg` function for storing MYBITMAP as JPEG file (10km).
+
+  1. modified logic for checking JPEG format (10km).
+
+  1. Support BIDI for UNICODE charsets and cleanup the implementation.
+    * New API: GetGlyphBIDIType
+    * BIDI flag for DC attribute.
+
+  1. Enhance commlcd engint to support more pixel type and synchronously update.
+
+  1. Add USVFB IAL engine and NEWGAL engine for web display server.
+
+* BUGFIXING:
+  1. handle `PNG_COLOR_TYPE_GRAY_ALPHA` color type of PNG files.
+  1. Fix a bug to free a null pointer (ReleaseDC).
+
 ## Version 3.2.0
 
 The MiniGUI development team announces the availability of MiniGUI 3.2.0.