Create Deposit and store deposit id + file path

Fixes #2 

User will be asked for Deposit title and open access. Thereafter deposit will be created with title, community and open_access as metadata. Deposit ID and file path are returned from B2SHARE and stored in variables.

See merge request !2

Create command line community selector

Fixes #1 

Communities are requested from B2SHARE, parsed in a dictionary and displayed to the user. The user select the community by typing a number between 0 and the number of communities. The user input is validated for his type and value. If  type or value is incorrect, the user is asked again. After a correct input the selected community is stored and deposit creation is called.

See merge request !1

Loop for user input unless a correct input was given. Community id is stored and deposit creation is called

create depositor package with a b2share depositor inside, run.py should only get some variables and instantiate the singleton depositor. Introduced class just for easier variable management.