adding a project ex47/ with all neccessary required files to work with the project
adding project files for exercise 48
creating code to test the lexicon vocabularies
deleting the file ex48/lib/ex48.rb
creating a file lexicon.rb to work with the lexicon vocabularies
deleting the file
adding a file ex48/lib/lexicon.gemspec
deleting the file
creating a lexicon directory
creating a lexicon file
adding a comment for fixing the code later
adding exercise 49 neccesary files for running the little project
adding code to parse simple sentences using the lexicon class