add a readme

README

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+A pretty straight translation from the ruby code in the jcoglan book.
+
+This code allows you to read and write a single gitconfig file.  
+
+Its a bit nasty as theres lots of string manipulation and the whole 
+idea of a key (foo.bar.baz) being split into [foo "bar"] with a baz
+variable and back again is all string heavy.  Also I had to create 
+the various containers to allow for string arrays.  Sections are
+stored in an array and a map because a map wont free the sections
+but a section will etc etc.
+
+ANyhoo, the smakefile creates a configreader binary that you can ignore
+its just a fake testharness.  The real outputs are configfile.lib and
+configfile.h which I copied into AmigaGit.  
+
+Over time we can improve or replace this code without cluttering up the 
+AmigaGit codebase too much.  Maybe building various parts of git in libs
+might make some encapsulation sense :-)
+
+I still have to make a makefile so this lib can build for vbcc.  For the moment the
+VBCC build of AmigaGit is broken as VBCC doesnt like the SAS-built lib.
+