Documented charset choices and guidelines

info/charset_documentation.md

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+#Charset guidelines
+## Notice
+WalrusROG allows only 254 characters (256 minus `\0` and `\xFF`) per font. While it may not fit for big alphabets or ideogram-based languages, it allows enough data for latin-based languages.
+
+If the charsets are esoteric, a tool should be done to allow encoding and previewing with fonts.
+
+##Preferred charset
+On a common point, Windows's version of extended Ascii (ANSI IIRC) provides enough characters (like accents) to cover most latin-based language.