Update README.md

README.md

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 ![Font sample](images/placard.jpg)
 
-For a specimen and information about OpenType features, see the file "Cissanthemos sample.pdf".
+Version 3 of Cissanthemos is a color font—that is, one in which the
+colors have been chosen by the designer. The colors of this font are
+based on those of the manuscript on which the font is based ans on
+other manuscripts contemporary with it. Capitals in this font can be
+filled with color for emphasis or decoration, and the colors can be
+customized in several ways; or, if you prefer, Cissanthemos can be 
+used as an ordinary black-and-white font (for details, see the
+[specimen page](https://psb1558.github.io/Cissanthemos-font/) and the
+[Cissanthemos sample and guide](https://github.com/psb1558/Cissanthemos-font/blob/master/Cissanthemos%20sample%20and%20guide.pdf).)