created separate directory for each os
added bash command
Added conf files for OS X PF

#Modification:
1. Added config file for `pf.conf` and other required files that will
provide the architecture.
restructured the read-rules.c code

#Modifications:
1. removed useless argument from `print_match()`
2. All structure definitions to the top
3. Changed the code layout, added proper indentation where required.
initial code for os x added, lang - c++

Also added build script to build / build+run the code,