Begin Xcode project for building liblouis as a static library or
including in other projects as .xcodeproj.
Fix conflicts with MacTypes.h:  Build was failing because items in 'typeform' enum in liblouis.h matched enum items found in MacTypes.h's "Quickdraw Types".
Define Xcode Preprocessor Macro HAVE_CONFIG_H=1 to include #define's from
config.h
Remove unecessary files from liblouis target in Xcode project.
Add README.md