Getting currencies and differencies from CBAR

## How to install
    1. Install pip package
        ```
        pip install Django-cbar-currency
        ```
    2. Configure directory for file
        In settings.py file set a directory
        ```
        CBAR_CURRENCY_ROOT = os.path.join(BASE_DIR, 'media', 'cbar')
        ```

## How to import
    ```
    from cbar_currency import Currency
    ```

## Functions
    1. Currency.cron_script()
        This function gets currency list with their values, differences and right them to file

    2. Currency.get_list()
        This function reads currency file and returns all currencies with their values and differencies as list

    3. Currency.get_specific_currencies(currencyList)
        This function returns specific currencies list which you give
        You should give currency names as list, for example  ['USD', 'EUR', 'RUB']

    4. Currency.get_currencies_by_priority(currencyList)
        This function returns all currencies list but currencies which you give will stay at the top of the list
        You should give currency names as list, for example  ['USD', 'EUR', 'RUB']

    5. Currency.get_list_from_cbar(date)
        This function returns all currencies list without differencies for the specific date