Initial commit of yesterday night's hack

Can index a directory tree given on the command line
and write it to stdout.
No options or search capabilities implemented yet.
The fdupe options are listed in main.cc as a "to do" comment.
Implemented duplicate search

Paths are hard-coded for a quick test, no options yet.
Index generation is thus disabled now
Index Generation + ext. duplicate search impl.

Argument parsing for these modes has been added.
Indexing tested -> works.
Duplicate search not yet tested in this form.
Duplicate search within the index directory not yet implemented.
Merge remote-tracking branch 'origin/master'

Github generated the LICENSE file when creating the repo,
merge this with the local code.
Added license comments and README.md file