Document V0.41.

update Chinese Japanese example

Chinese_Japanese.md

@@ -0,0 +1,14 @@
+# Chinese Japanese and Korean characters
+
+The file `chinese_japanese` contains the following characters. It may be used
+(in full, or edited) to perpare Python font files for these languages with the
+`-k` or `--charset_file` option. The source TTF or OTF file must contain the
+relevant glyphs. 
+
+# charset range
+
+|language|range|
+|---|---|
+|ASCII|Total 96 chars|
+|Chinese|Contain 6763 Chars in [GB/T 2312-1980](https://openstd.samr.gov.cn/bzgk/gb/newGbInfo?hcno=5664A728BD9D523DE3B99BC37AC7A2CC) and `啰`、`喰`、`瞭`、`𬌗`|
+|Japanese|Total 174 hiragana and katakana characters|

FONT_TO_PY.md

@@ -11,7 +11,12 @@ resource-limited targets: the font file may be incorporated into a firmware
 build such that it occupies flash memory rather than scarce RAM. Python code
 built into firmware is known as frozen bytecode.
 
-## 1.1 Recent revisions
+## 1.1 Revision history
+
+30 Jan 2023 V0.41 With thanks to @ferrolive (Igor Oliveira) who supplied the
+charset file.
+ 1. Charset file enables Chinese, Japanese and Korean glyphs to be specified.
+ 2. Now allows much larger output files: sparse index is now 24 bit.
 
 1 Feb 2021 V0.4 With thanks to @enigmaniac for the suggestion and code ideas.
  1. Now supports `bdf` and `pcf` font files for better results at small sizes.

font_to_py.py

@@ -11,7 +11,7 @@
 
 # The MIT License (MIT)
 #
-# Copyright (c) 2016-2021 Peter Hinch
+# Copyright (c) 2016-2023 Peter Hinch
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the "Software"), to deal