[cantarell-fonts] Updated README with better information about development practices

[Dave Crossland <dcrossland src gnome org>]

commit 4f168ff80de8a96bf43325044c4c4c04e495a859
Author: Dave Crossland <dave understandinglimited com>
Date:   Mon Mar 21 22:13:55 2011 -0400

    Updated README with better information about development practices

 README |   15 +++++++++++----
 1 files changed, 11 insertions(+), 4 deletions(-)
---
diff --git a/README b/README
index d9a7148..8521f5d 100644
--- a/README
+++ b/README
@@ -74,11 +74,18 @@ Developer information
 ---------------------
                                   
 The original src/Cantarell-Regular.sfd file has the master sources 
-in a mix of Spiro and Cubic (PostScript) Bezier forms. This _master_ 
-source was used to generate the Cantarell-Bold.sfd which is thus
-a hard fork. 
-
-All changes are made to these drawing files, and when OTF or TTF
+as Cubic (PostScript) Bezier splines. There are temporary layers 
+and a 'Spiro' layer in this file, containing forms used to create 
+the master Cubic Bezier glyphs; the Spiro layer contains forms in 
+Spiro splines, and much of the original typeface design by Dave
+Crossland was done by drawing in Spiro splines. However today the
+master drawing spline format is Cubic Bezier, and Spiro splines
+are used to inform their creation. 
+
+The Cantarell-Regular.sfd file is the _master_ source, and was 
+used to generate the Cantarell-Bold.sfd which is now a hard fork. 
+
+All changes are made to these drawing files. When OTF or TTF
 binaries are compiled, they are copied to the Cantarell-*-OTF.sfd
 and Cantarell-*-TTF.sfd files and then a build process applied; 
 this means that there should be a 1:1 match between these files,