Lvuiui 42

@xcomanche , @lhalam , @doljura , @kuzbida , @mariyamoroz , @MyrosiaPabyrivska , @vdanyliv  , @rshuv-rmn  , @rmkown 

adding sinatra
created integration with sinatra and mysql for users module. CRUD for users is working.
sinatra configuration and basic usage is provided in the readme file for this repo

warning! current json files are not working with sinatra
remove commented code