Created merge_datasets function
Created extract_mean_and_std function (question 2)
Fixed bug in extract_mean_and_std function (question 2)
Created name_activities function (question 3)
Changed name_activities function to use activity names from the specific file(question 3)
Created labels_dataset function (question 4)
Created avg_tidydata function (question 5)
Created create_file function
Created function to call all function of the script
Created get_datasets function that check and/or download de datasets
Created README file with the short description